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id="thread_subject">光束质量M2是一个什么概念？</span> </h1> <span class="xg1"> <img src="static/image/common/hot_3.gif" alt="" title="热度: 72" /> <a href="http://bbs.oecr.com/thread-80837-1-1.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_759267" ><table id="pid759267" class="plhin" summary="pid759267" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar759267" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-123445.html" target="_blank" class="xw1" style="color: #FF99FF">zhangjingru8311</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo759267" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo759267_ma"></div> </div> <div class="i y"> <div> <strong><a 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href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=80837&pid=759281" id="postnum759281" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>26</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon759281" src="static/image/common/online_member.gif" /> <em id="authorposton759281">发表于 2011-3-30 15:19:52</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=80837&page=3&authorid=121078" 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_759281"> 有个专家出来介绍下！让咱们学习下 谢谢<img src="static/image/smiley/Tiger/09.gif" smilieid="147" border="0" alt="" /></td></tr></table> </div> <div id="comment_759281" class="cm"> </div> <div id="post_rate_div_759281"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr 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href="http://club.oecr.com/space-uid-90507.html" target="_blank" class="xw1" style="color: #FFCC00">optro</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo759290" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo759290_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-90507.html" target="_blank" class="xi2" style="color: #FFCC00">optro</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=90507&do=profile" target="_blank" class="xi2">7937</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=90507&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=optro" id="a_showip_li_759290" 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=optro" id="a_repent_759290" 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-90507.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=90507&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=80837&pid=759290" id="postnum759290" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>27</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon759290" src="static/image/common/online_member.gif" /> <em id="authorposton759290">发表于 2011-3-30 15:31:18</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=80837&page=3&authorid=90507" 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_759290"> M数是指实际激光束的一个比值，任何一束光总有两个数据，来描述它的光学特性，一个是光斑直径，一个数束散角，他们的乘积直径*角度（全角），对于任何光束都有一个极限值，对于激光这个极限值也叫单模是，1.27*波长（单位微米），例如1.06微米激光单模既是1.35毫米毫弧度。<br /> 评价一台激光束的光束质量，有时用多少毫米*毫弧度，有时用几个M数，这个几一定大于1.<br /> 为什么有用M2来评价激光束？<br /> 原因是，无论用在加工、传输，最后是功率密度和瑞利长度决定的，也就是激光亮度、光通量决定的。<br /> <br /> 因此，在判断一台高功率激光器的好坏，一定是单位（毫米*毫弧度）的平方功率决定的。回到中国科学院西安光机所的哪台1000瓦光线激光器，其实亮度不如一瓦的单模固体激光器。</td></tr></table> </div> <div id="comment_759290" class="cm"> <h3 class="psth xs1"><span class="icon_ring vm"></span>点评</h3> <div class="pstl xs1 cl"> <div class="psta vm"> <a href="http://club.oecr.com/space-uid-83803.html" c="1"><img src="http://www.oecr.com/uc_server/avatar.php?uid=83803&size=small" /></a> <a href="http://club.oecr.com/space-uid-83803.html" class="xi2 xw1">弥勒</a> </div> <div class="psti"> 1.27*波长（单位微米）， 想问一下这个1.27是怎么来的。最好不要让我去翻书，我要是喜欢翻书，早就不在这里混了。 <span class="xg1"> 发表于 2011-4-1 16:03</span> </div> </div> </div> <div id="post_rate_div_759290"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition759290"></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=80837&repquote=759290&extra=page%3D1&page=3" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=80837&pid=759290&hash=46c60ccc" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_759290').innerHTML ? $('review_support_759290').innerHTML : 0) + ' 人 支持'">支持 <span 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class="xi2">114</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=124955&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=290579657" id="a_showip_li_763561" 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=290579657" id="a_repent_763561" 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-124955.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=124955&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=80837&pid=763561" id="postnum763561" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>28</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon763561" src="static/image/common/online_member.gif" /> <em id="authorposton763561">发表于 2011-4-6 12:51:53</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=80837&page=3&authorid=124955" 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_763561"> <img src="static/image/smiley/Tiger/40.gif" smilieid="178" border="0" alt="" /><img src="static/image/smiley/Tiger/40.gif" smilieid="178" border="0" alt="" /><img src="static/image/smiley/Tiger/40.gif" smilieid="178" border="0" alt="" /></td></tr></table> </div> <div id="comment_763561" class="cm"> </div> <div id="post_rate_div_763561"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition763561"></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=80837&repquote=763561&extra=page%3D1&page=3" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=80837&pid=763561&hash=46c60ccc" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_763561').innerHTML ? $('review_support_763561').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_763561"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=80837&pid=763561&hash=46c60ccc" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_763561').innerHTML ? 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<tr> <td class="pls" rowspan="2"> <div id="favatar778381" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-107795.html" target="_blank" class="xw1" style="color: #666666">liluplanet</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo778381" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo778381_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-107795.html" target="_blank" class="xi2" style="color: #666666">liluplanet</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=107795&do=profile" target="_blank" class="xi2">4248</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=107795&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=liluplanet" id="a_showip_li_778381" 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=liluplanet" id="a_repent_778381" 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">头像被屏蔽</div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=80837&pid=778381" id="postnum778381" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>29</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon778381" src="static/image/common/online_member.gif" /> <em id="authorposton778381">发表于 2011-4-24 21:00:46</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=80837&page=3&authorid=107795" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <div class="locked">提示: <em>作者被禁止或删除 内容自动屏蔽</em></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition778381"></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=80837&repquote=778381&extra=page%3D1&page=3" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=80837&pid=778381&hash=46c60ccc" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_778381').innerHTML ? $('review_support_778381').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_778381"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=80837&pid=778381&hash=46c60ccc" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_against_778381').innerHTML ? $('review_against_778381').innerHTML : 0) + ' 人 反对'">反对 <span id="review_against_778381"></span></a> </em> <p> <a href="javascript:;" id="mgc_post_778381" onmouseover="showMenu(this.id)" class="showmenu">使用道具</a> <a href="javascript:;" onclick="showWindow('miscreport778381', 'misc.php?mod=report&rtype=post&rid=778381&tid=80837&fid=7', 'get', -1);return false;">举报</a> </p> <ul id="mgc_post_778381_menu" class="p_pop mgcmn" style="display: none;"> <li><a href="http://club.oecr.com/home.php?mod=magic&mid=namepost&idtype=pid&id=778381:80837" id="a_namepost_778381" 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_778381')</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_819281" ><table id="pid819281" class="plhin" summary="pid819281" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar819281" class="pls favatar"> <a name="lastpost"></a><div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-127499.html" target="_blank" class="xw1" style="color: #FFCCCC">Happywen</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo819281" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo819281_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-127499.html" target="_blank" class="xi2" style="color: #FFCCCC">Happywen</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=127499&do=profile" target="_blank" class="xi2">350</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=127499&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=Happywen" id="a_showip_li_819281" 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=Happywen" id="a_repent_819281" 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-127499.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=127499&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=80837&pid=819281" id="postnum819281" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>30</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon819281" src="static/image/common/online_member.gif" /> <em id="authorposton819281">发表于 2011-5-30 15:01:20</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=80837&page=3&authorid=127499" 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_819281"> 这只是个衡量因子吧，一般不需要计算的吧</td></tr></table> </div> <div id="comment_819281" class="cm"> </div> <div id="post_rate_div_819281"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition819281"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div 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