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$('sharenumber').innerHTML + ' 人分享'"><i><img src="static/image/common/oshr.png" alt="分享" />分享<span id="sharenumber">0</span></i></a> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=252385" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span id="favoritenumber">0</span></i></a> <a id="recommend_add" href="forum.php?mod=misc&action=recommend&do=add&tid=252385&hash=7bbf9a05" onclick="showWindow('login', this.href)" onmouseover="this.title = $('recommendv_add').innerHTML + ' 人支持'"><i><img src="static/image/common/rec_add.gif" alt="支持" />支持<span id="recommendv_add">0</span></i></a> <a id="recommend_subtract" href="forum.php?mod=misc&action=recommend&do=subtract&tid=252385&hash=7bbf9a05" onclick="showWindow('login', this.href)" onmouseover="this.title = $('recommendv_subtract').innerHTML + ' 人反对'"><i><img src="static/image/common/rec_subtract.gif" alt="反对" />反对<span id="recommendv_subtract">0</span></i></a> </div> </td> <td valign="top" class="album_side_r"> <div class="album_side"> <div class="hm mtn mbn"> <a href="http://club.oecr.com/space-uid-104929.html" target="_blank" class="xi2"><img src="http://www.oecr.com/uc_server/avatar.php?uid=104929&size=small" /></a> <span class="tit_author"> <a href="http://club.oecr.com/space-uid-104929.html">houshannanhai</a> </span> </div> <div class="date"><span>发布时间:</span> 2012-7-24 00:02</div> <div class="album_info"> <h3>正文摘要: </h3> <p> 之前，我做过将从光纤发出的激光准直。现在想将从芯径大概2mm，数值孔径0.3的光纤输出的激光聚焦，聚焦光斑要求至少比芯径小5倍以上。 以前，有些问题我没考虑过，现在想到了，想请各位帮忙看看。 ...</p> </div> </div> </td> </tr> </table> </div> </div> <div class="bm vw pl" id="comment"> <div class="bm_h cl"> <h2>回复</h2> </div> <div class="bm_c"> <div id="postlistreply" class="xld xlda mbm"><div id="post_new" class="viewthread_table" style="display: none"></div></div><div id="post_1030942" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-140220.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=140220&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-140220.html" target="_blank" class="xi2">查水表的</a><em id="author_1030942"> 发表于</em> <span class="xg1 xw0">2012-8-16 17:45:30</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_1030942"> 刘明</td></tr></table> </div> <div id="comment_1030942" class="cm"> </div> <div id="post_rate_div_1030942"></div> </div> </dd> </dl> </div> <div id="post_1027919" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-7958.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=7958&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-7958.html" target="_blank" class="xi2">wang</a><em id="author_1027919"> 发表于</em> <span class="xg1 xw0">2012-7-30 11:31:23</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_1027919"> 你去google一下BPP，如果还搞不懂，留言...</td></tr></table> </div> <div id="comment_1027919" class="cm"> </div> <div id="post_rate_div_1027919"></div> </div> </dd> </dl> </div> <div id="post_1027292" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-34822.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=34822&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-34822.html" target="_blank" class="xi2">lilook</a><em id="author_1027292"> 发表于</em> <span class="xg1 xw0">2012-7-26 21:55:45</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_1027292"> <i class="pstatus"> 本帖最后由 lilook 于 2012-7-26 22:16 编辑 </i><br /> <br /> 就我所知的，说一下，说得不对请原谅。<br /> 激光经光纤传输后的NA，跟很多因素有关，首先，是光纤的类型，即是SI还是GI，如果是SI，在NA以内，出射的发散角等于入射的发散角。对于GI，在NA以内，不管以多大发散角进去，出来总是充满NA，注意是充满NA。<br /> <br /> 关于从光纤出来的光，直接经过透镜聚焦，也是可以的，需要注意像差。用非球面镜会好很多。<br /> <br /> 最后一个，聚焦光斑的问题，第一张图是非常正确的，第二张也是正确的，但是第二张没有说明光斑的位置。其实这个公式计算的是<font color="Red">透镜像方焦平面处的光斑大小</font>。你将焦距代入第一张的公式，也同样会得出这样的结果。<br /> <br /> <br /> <br /> 特别注意，激光经过光纤后，如何模拟及计算，我也不知道。求指教中。。。</td></tr></table> </div> <div id="comment_1027292" class="cm"> </div> <div id="post_rate_div_1027292"></div> </div> </dd> </dl> </div> <div id="post_1027219" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-18999.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=18999&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-18999.html" target="_blank" class="xi2">kkkyt</a><em id="author_1027219"> 发表于</em> <span class="xg1 xw0">2012-7-26 15:09:07</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_1027219"> 嗯。我一般认为还是按光纤的数值孔径来计算。</td></tr></table> </div> <div id="comment_1027219" class="cm"> </div> <div id="post_rate_div_1027219"></div> </div> </dd> </dl> </div> </div> </div> </div> <script type="text/javascript"> new lazyload(); </script> <div class="wp mtn"> <!--[diy=diy3]--><div id="diy3" class="area"></div><!--[/diy]--> </div></div> </div> <!--autocomment filter by maxnum--> <div class="ft_wp"> <div id="ft" class=" cl"> <div id="flk" > <p> <a href="http://wpa.qq.com/msgrd?V=3&Uin=20600600&Site=光电工程师社区&Menu=yes&from=discuz" target="_blank" title="QQ"><img src="static/image/common/site_qq.jpg" alt="QQ" /></a><span class="pipe">|</span><a href="http://m.oecr.com" >手机版</a><span class="pipe">|</span><a href="http://so.oecr.com" title="站内搜索" target="_blank" >搜索</a><span class="pipe">|</span><a href="http://www.focaloptics.com" 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