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<h1 class="ts"> <span id="thread_subject">[求助]激光聚焦问题</span> </h1> <span class="xg1"> <a href="http://bbs.oecr.com/thread-30747-1-1.html" onclick="return copyThreadUrl(this, '光电工程师社区')" >[复制链接]</a> </span> </td> </tr> </table> <table cellspacing="0" cellpadding="0" class="ad"> <tr> <td class="pls"> </td> <td class="plc"> </td> </tr> </table><div class="postaaa posta0" id="post_230884" ><table id="pid230884" class="plhin" summary="pid230884" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar230884" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-14001.html" target="_blank" class="xw1" style="color: #FF9900">hx0999</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo230884" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo230884_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-14001.html" target="_blank" class="xi2" 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虚心学习中................</td></tr></table> </div> <div id="comment_230884" class="cm"> </div> <div id="post_rate_div_230884"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition230884"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=230884&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=230884&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_230884').innerHTML ? $('review_support_230884').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_230884"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=230884&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title 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href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=lymex" id="a_showip_li_231012" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=lymex" id="a_repent_231012" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-24536.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=24536&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=231012" id="postnum231012" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>14</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon231012" src="static/image/common/online_member.gif" /> <em id="authorposton231012">发表于 2005-2-2 00:21:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=24536" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_231012"> <div class="quote"><blockquote><B>以下是引用<I>st_laser</I>在2005-1-27 16:35:15的发言：</B> <P>可是根据理论上，聚焦光斑越小，聚焦透镜焦距要越小，根据你的计算方法，好像要聚焦镜焦距大一些，这是矛盾还是我没理解你的意思？</P> <P>烦再请赐教！</P></blockquote></div> <P>您的这个理论出自何处？ <P>理论上讲，聚焦光斑要求越小，就需要更大的相对口径。这个是光的干涉效应所决定的。相对口径=绝对口径/焦距，在焦距不变的情况下就需要更大的（绝对）口径，或者在绝对口径不变的情况下减少焦距。不过，相对口径大的镜子很难，而且有一个理论限制。相对口径与NA（数值孔径）有一定的关系，在显微镜里，为了增大分辨力，必须增加NA。理论上，长焦透镜完全可以和短焦透镜聚焦一样的好，只不过长焦的不好加工、价格贵。但短焦的就不能在远距离上聚焦，因此就必须用长焦的了。 <P>一个理论上的东西，转化成经验公式：波长为a的光，透过口径为D的透镜（或天线），在距离为L的地方聚焦，则光斑最小为d = a * L / D</P></td></tr></table> </div> <div id="comment_231012" class="cm"> </div> <div id="post_rate_div_231012"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition231012"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=231012&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=231012&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_231012').innerHTML ? $('review_support_231012').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_231012"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=231012&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_231012').innerHTML ? $('review_against_231012').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_231012"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_231012" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport231012', 'misc.php?mod=report&rtype=post&rid=231012&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_231012_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=231012:30747" id="a_namepost_231012" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_231012')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta2" id="post_231034" ><table id="pid231034" class="plhin" summary="pid231034" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar231034" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xw1" style="color: #FF00CC">lymex</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo231034" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo231034_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xi2" style="color: #FF00CC">lymex</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" class="xi2">2575</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=lymex" id="a_showip_li_231034" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=lymex" id="a_repent_231034" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-24536.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=24536&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=231034" id="postnum231034" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>15</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon231034" src="static/image/common/online_member.gif" /> <em id="authorposton231034">发表于 2005-2-2 00:51:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=24536" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_231034"> <P>干脆写一个过程吧。 制约激光的发散有两个因素，一个是光的干涉，公式见上，另一个是激光源的不理想（并非点光源或平行光源）。前者要用到光的干涉公式来计算，上面我已经给出一个简化的模型。后者很简单，用成像公式就可以。下面举例说明。</P><P>1、条件，808nm的激光管，发光宽度为100um，发散角30度左右 2、需求，在100m处会聚的光斑不大于d = 0.1m。换句话说，发散角要小于0.1m/100m = 1mrad。另外，要求把尽可能的光能发射出去。 3、根据公式d = a * L / D，其中a为光的饿波长、L为镜头到像的距离，D为镜头口径。求得D = a * L / d = 1mm，这个很容易，因此光的干涉不是什么问题 4、为了能会聚激光二极管的发散光，要求镜头有一定的相对口径（光圈），f/2比较合适。f/2.8就有一定损失了，但f/1.4以上的镜头比较难找。 5、根据成像公式，物/焦距=像/距离，即100um / F = d / L，因此焦距 = 100um * L / d = 100mm。换句话说，你需要找一个焦距为100mm、光圈为f/2的镜头才可以达到目的。这样的镜头还是比较好找的，例如摄像机的镜头。</P><P>1mrad并非是一个很高的要求，如果激光是理想的，那么用很小的透镜就可以满足。但正因为激光的不理想，使得我们不得不用大的透镜。</P><P>镜头/透镜问题，普通摄影/摄像镜头并不一定很合适，因为对特定光的透射不一定很理想。最好就是非球面的镀有增透膜的单片透镜。CD上的透镜就是这样的，成本比较低而且光圈大。</P></td></tr></table> </div> <div id="comment_231034" class="cm"> </div> <div id="post_rate_div_231034"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition231034"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=231034&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=231034&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_231034').innerHTML ? $('review_support_231034').innerHTML : 0) + ' 人 支持'">支持 <span 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reload="1">checkmgcmn('post_231034')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta3" id="post_231210" ><table id="pid231210" class="plhin" summary="pid231210" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar231210" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-20681.html" target="_blank" class="xw1" style="color: #FF00CC">st_laser</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo231210" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo231210_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-20681.html" target="_blank" class="xi2" style="color: #FF00CC">st_laser</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=20681&do=profile" target="_blank" class="xi2">2699</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=20681&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=st_laser" id="a_showip_li_231210" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=st_laser" id="a_repent_231210" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-20681.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=20681&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=231210" id="postnum231210" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>16</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon231210" src="static/image/common/ico_lz.png" /> 楼主<span class="pipe">|</span> <em id="authorposton231210">发表于 2005-2-2 17:45:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=20681" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_231210"> 谢谢了，可是还有一个更麻烦的问题，要是出射光成一条线，即在外面还要加一个柱面镜，如果口径这么大的透镜前面加柱面镜，那难度是很大的，而且柱面镜一般是整个圆柱体型的。</td></tr></table> </div> <div id="comment_231210" class="cm"> </div> <div id="post_rate_div_231210"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition231210"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=231210&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=231210&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_231210').innerHTML ? $('review_support_231210').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_231210"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=231210&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_231210').innerHTML ? $('review_against_231210').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_231210"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_231210" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport231210', 'misc.php?mod=report&rtype=post&rid=231210&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_231210_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=231210:30747" id="a_namepost_231210" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_231210')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta4" id="post_231511" ><table id="pid231511" class="plhin" summary="pid231511" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar231511" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xw1" style="color: #FF00CC">lymex</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo231511" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo231511_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xi2" style="color: #FF00CC">lymex</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" class="xi2">2575</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=lymex" id="a_showip_li_231511" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=lymex" id="a_repent_231511" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-24536.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=24536&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=231511" id="postnum231511" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>17</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon231511" src="static/image/common/online_member.gif" /> <em id="authorposton231511">发表于 2005-2-3 21:08:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=24536" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_231511"> 柱面镜可以加在里面。</td></tr></table> </div> <div id="comment_231511" class="cm"> </div> <div id="post_rate_div_231511"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition231511"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=231511&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=231511&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_231511').innerHTML ? $('review_support_231511').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_231511"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=231511&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_231511').innerHTML ? $('review_against_231511').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_231511"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_231511" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport231511', 'misc.php?mod=report&rtype=post&rid=231511&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_231511_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=231511:30747" id="a_namepost_231511" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_231511')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta5" id="post_233057" ><table id="pid233057" class="plhin" summary="pid233057" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar233057" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-25817.html" target="_blank" class="xw1" style="color: #FF99FF">cloudstar</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo233057" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo233057_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-25817.html" target="_blank" class="xi2" style="color: #FF99FF">cloudstar</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=25817&do=profile" target="_blank" class="xi2">742</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=25817&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=cloudstar" id="a_showip_li_233057" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=cloudstar" id="a_repent_233057" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-25817.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=25817&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=233057" id="postnum233057" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>18</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon233057" src="static/image/common/online_member.gif" /> <em id="authorposton233057">发表于 2005-2-16 18:03:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=25817" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_233057"> 15楼的兄弟，请问相对口径（光圈）镜头口径有什么区别？你15楼的留言让我云里雾里！还有数值孔径怎么理解那？不好意思，谢谢赐教</td></tr></table> </div> <div id="comment_233057" class="cm"> </div> <div id="post_rate_div_233057"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition233057"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=233057&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=233057&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_233057').innerHTML ? $('review_support_233057').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_233057"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=233057&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_233057').innerHTML ? $('review_against_233057').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_233057"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_233057" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport233057', 'misc.php?mod=report&rtype=post&rid=233057&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_233057_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=233057:30747" id="a_namepost_233057" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_233057')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta6" id="post_234150" ><table id="pid234150" class="plhin" summary="pid234150" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar234150" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-20708.html" target="_blank" class="xw1" style="color: #FF99FF">头皮</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo234150" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo234150_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-20708.html" target="_blank" class="xi2" style="color: #FF99FF">头皮</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=20708&do=profile" target="_blank" class="xi2">1029</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=20708&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=%CD%B7%C6%A4" id="a_showip_li_234150" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=%CD%B7%C6%A4" id="a_repent_234150" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-20708.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=20708&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=234150" id="postnum234150" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>19</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon234150" src="static/image/common/online_member.gif" /> <em id="authorposton234150">发表于 2005-2-21 19:56:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=20708" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_234150"> <P>楼上的兄弟，看一下书就知道什么是NA了！</P><P>还有，多谢高手的赐教，很有收获啊!</P></td></tr></table> </div> <div id="comment_234150" class="cm"> </div> <div id="post_rate_div_234150"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition234150"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=234150&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=234150&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_234150').innerHTML ? $('review_support_234150').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_234150"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=234150&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_234150').innerHTML ? $('review_against_234150').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_234150"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_234150" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport234150', 'misc.php?mod=report&rtype=post&rid=234150&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_234150_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=234150:30747" id="a_namepost_234150" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_234150')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta7" id="post_234385" ><table id="pid234385" class="plhin" summary="pid234385" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar234385" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-25817.html" target="_blank" class="xw1" style="color: #FF99FF">cloudstar</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo234385" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo234385_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-25817.html" target="_blank" class="xi2" style="color: #FF99FF">cloudstar</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=25817&do=profile" target="_blank" class="xi2">742</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=25817&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=cloudstar" id="a_showip_li_234385" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=cloudstar" id="a_repent_234385" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-25817.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=25817&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=234385" id="postnum234385" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>20</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon234385" src="static/image/common/online_member.gif" /> <em id="authorposton234385">发表于 2005-2-22 17:15:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=25817" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_234385"> 呵呵，找不到相关书籍，能给介绍下吗？？</td></tr></table> </div> <div id="comment_234385" class="cm"> </div> <div id="post_rate_div_234385"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition234385"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=234385&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=234385&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_234385').innerHTML ? $('review_support_234385').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_234385"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=234385&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_234385').innerHTML ? $('review_against_234385').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_234385"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_234385" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport234385', 'misc.php?mod=report&rtype=post&rid=234385&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_234385_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=234385:30747" id="a_namepost_234385" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_234385')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta8" id="post_234625" ><table id="pid234625" class="plhin" summary="pid234625" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar234625" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xw1" style="color: #FF00CC">lymex</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo234625" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo234625_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-24536.html" target="_blank" class="xi2" style="color: #FF00CC">lymex</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" class="xi2">2575</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=24536&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=lymex" id="a_showip_li_234625" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=lymex" id="a_repent_234625" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-24536.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=24536&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=234625" id="postnum234625" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>21</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon234625" src="static/image/common/online_member.gif" /> <em id="authorposton234625">发表于 2005-2-23 07:03:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=24536" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_234625"> <div class="quote"><blockquote><B>以下是引用<I>cloudstar</I>在2005-2-16 10:03:41的发言：</B> 15楼的兄弟，请问相对口径（光圈）镜头口径有什么区别？你15楼的留言让我云里雾里！还有数值孔径怎么理解那？不好意思，谢谢赐教</blockquote></div> <P>相对口径就是口径/焦距。假设口径10mm、焦距28mm，那么相对光圈就是10/28=1/2.8，称为f/2.8，简称光圈2.8。数值孔径=NA，当折射率=1时，为sin(u)，而相对口径为2tan(u)。这东西可以在光学书上找到，但用途不大。</P></td></tr></table> </div> <div id="comment_234625" class="cm"> </div> <div id="post_rate_div_234625"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition234625"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=234625&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=234625&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_234625').innerHTML ? $('review_support_234625').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_234625"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=234625&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_234625').innerHTML ? $('review_against_234625').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_234625"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_234625" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport234625', 'misc.php?mod=report&rtype=post&rid=234625&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_234625_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=234625:30747" id="a_namepost_234625" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_234625')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta9" id="post_235013" ><table id="pid235013" class="plhin" summary="pid235013" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar235013" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-25139.html" target="_blank" class="xw1" style="color: #00FF99">chenzhihang88</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo235013" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo235013_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-25139.html" target="_blank" class="xi2" style="color: #00FF99">chenzhihang88</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=25139&do=profile" target="_blank" class="xi2">554</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=25139&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=chenzhihang88" id="a_showip_li_235013" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=chenzhihang88" id="a_repent_235013" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-25139.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=25139&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=235013" id="postnum235013" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>22</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon235013" src="static/image/common/online_member.gif" /> <em id="authorposton235013">发表于 2005-2-24 19:43:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=25139" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_235013"> <P>我们有直径6毫米非球面透镜相对口经小于1。直经5毫米光束能聚交在0。02毫米内不知对你是否有用</P></td></tr></table> </div> <div id="comment_235013" class="cm"> </div> <div id="post_rate_div_235013"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition235013"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=235013&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=235013&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_235013').innerHTML ? $('review_support_235013').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_235013"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=235013&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_235013').innerHTML ? $('review_against_235013').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_235013"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_235013" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport235013', 'misc.php?mod=report&rtype=post&rid=235013&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_235013_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=235013:30747" id="a_namepost_235013" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_235013')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta10" id="post_235108" ><table id="pid235108" class="plhin" summary="pid235108" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar235108" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-5557.html" target="_blank" class="xw1" style="color: #33FF00">millay</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo235108" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo235108_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-5557.html" target="_blank" class="xi2" style="color: #33FF00">millay</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=5557&do=profile" target="_blank" class="xi2">601</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=5557&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=millay" id="a_showip_li_235108" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=millay" id="a_repent_235108" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-5557.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=5557&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=235108" id="postnum235108" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>23</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon235108" src="static/image/common/online_member.gif" /> <em id="authorposton235108">发表于 2005-2-25 00:30:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=5557" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_235108"> <P>请问如果要把半导体激光器光斑汇聚成小于0.2mm的条形光斑，采用一个柱透镜可以实现吗？</P></td></tr></table> </div> <div id="comment_235108" class="cm"> </div> <div id="post_rate_div_235108"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition235108"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=235108&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=30747&pid=235108&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_235108').innerHTML ? $('review_support_235108').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_235108"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=30747&pid=235108&hash=db704bb5" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_235108').innerHTML ? $('review_against_235108').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_235108"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_235108" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport235108', 'misc.php?mod=report&rtype=post&rid=235108&tid=30747&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_235108_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=235108:30747" id="a_namepost_235108" onclick="showWindow(this.id, this.href)"><img src="static/image/magic/namepost.small.gif" />显身卡</a><li> </ul> <script type="text/javascript" reload="1">checkmgcmn('post_235108')</script> </div> </div> </td> </tr> <tr class="ad"> <td class="pls"> </td> <td class="plc"> </td> </tr> </table> </div><div class="postaaa posta11" id="post_236307" ><table id="pid236307" class="plhin" summary="pid236307" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar236307" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-22275.html" target="_blank" class="xw1" style="color: #FF99FF">ujff0574</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo236307" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo236307_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-22275.html" target="_blank" class="xi2" style="color: #FF99FF">ujff0574</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=22275&do=profile" target="_blank" class="xi2">1002</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=22275&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=ujff0574" id="a_showip_li_236307" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=ujff0574" id="a_repent_236307" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-22275.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=22275&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=30747&pid=236307" id="postnum236307" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>24</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon236307" src="static/image/common/online_member.gif" /> <em id="authorposton236307">发表于 2005-3-1 15:50:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=30747&page=2&authorid=22275" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_236307"> 为什么红光的出来的光都是椭圆的??</td></tr></table> </div> <div id="comment_236307" class="cm"> </div> <div id="post_rate_div_236307"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition236307"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=7&tid=30747&repquote=236307&extra=page%3D1&page=2" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" 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