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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=97879" 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=97879&hash=3fdb316c" 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=97879&hash=3fdb316c" 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-12381.html" target="_blank" class="xi2"><img src="http://www.oecr.com/uc_server/avatar.php?uid=12381&size=small" /></a> <span class="tit_author"> <a href="http://club.oecr.com/space-uid-12381.html">无聊瓜子</a> </span> </div> <div class="date"><span>发布时间:</span> 2010-1-6 21:42</div> <div class="album_info"> <h3>正文摘要: </h3> <p> 本帖最后由 无聊瓜子 于 2010-1-7 08:01 编辑 现在在做一个实验,用一光纤来耦合激光. 激光的入射角的正弦小于光纤的数值孔径(NA) 想问问各位,从光纤输出时候的发散半角是多大,其正弦等于光纤的NA吗? 有文献说 ...</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_662029" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-12381.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=12381&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-12381.html" target="_blank" class="xi2">无聊瓜子</a><em id="author_662029"> 发表于</em> <span class="xg1 xw0">2010-8-6 17:38:18</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_662029"> 这么好的帖子都没人回答.我晕啊<br /> <br /> 我想知道的是:当耦合入射角的正炫小于光纤的NA时,是不是耦合出射角等于偶合入射角.<br /> <br /> 有人说,不管入射角多大,出射角的正炫都等于光纤的NA.<br /> <br /> 到底是什么情况啊?</td></tr></table> </div> <div id="comment_662029" class="cm"> </div> <div id="post_rate_div_662029"></div> </div> </dd> </dl> </div> <div id="post_662016" 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_662016"> 发表于</em> <span class="xg1 xw0">2010-8-6 16:38:28</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_662016"> 忽略别的因素，比如杂质啊，光纤的弯曲等，对于SI光纤，出射的NA就等于入射的NA。</td></tr></table> </div> <div id="comment_662016" class="cm"> </div> <div id="post_rate_div_662016"></div> </div> </dd> </dl> </div> <div id="post_621610" class="xld xlda mbm"><dl class="bbda cl"> <dd class="m avt"><a href="http://club.oecr.com/space-uid-702.html"><img src="http://www.oecr.com/uc_server/avatar.php?uid=702&size=small" /></a></dd> <dt> <span class="y xw0"> </span> <a href="http://club.oecr.com/space-uid-702.html" target="_blank" class="xi2">badan</a><em id="author_621610"> 发表于</em> <span class="xg1 xw0">2010-1-7 16:18:42</span> </dt> <dd class="z"><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_621610"> <i class="pstatus"> 本帖最后由 badan 于 2010-1-7 16:19 编辑 </i><br /> <br /> 我是这样理解这个问题的：<br /> 对于多模光纤，如果光纤没有任何缺陷，并且没有任何弯曲，入射是什么样的激光，出射也是什么样的；但是，光纤都是有缺陷的，使用时也都会有弯曲，因此，出来的光束质量会比入射激光的光束质量差一些，但很多时候，出射的激光的数值孔径会小于光纤的数值孔径，具体小多少，跟激光光束质量，耦合镜和光纤的弯曲、缺陷都有关系。</td></tr></table> </div> <div id="comment_621610" class="cm"> </div> <div id="post_rate_div_621610"></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 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