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class="bm_c xld"> <b>长光所薄膜光学PPT:</b><div class="postmsg"><img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /><br /> <br /> [<i> 本帖最后由 EinsteinDirac 于 2008-4-11 22:06 编辑 </i>]</div> <div class="postmsg">顶了再看.........................</div> <div class="postmsg">大家顶一下啊！<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> 谢了</div> <div class="postmsg">学习学习，好好学学！！！！<img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /></div> <div class="postmsg">瞧瞧，看看是什么好东东。。。。。。。。。。</div> <div class="postmsg">不错的资料哦！！！<img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /></div> <div class="postmsg">谢谢LZ，，，呵呵，，，真好！！！<br /> 支持LZ，</div> <div class="postmsg"><img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> 嘿嘿嘿，我有全的，你要不要？</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>Nd:YAG</i> 于 2008-4-17 08:17 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=444773&ptid=68448" target="_blank"><img id="aimg_s5jrW" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> 嘿嘿嘿，我有全的，你要不要？ </blockquote></div><br /> 要，Nd：YAG快传上来</div> <div class="postmsg">哈哈，谢谢了，刚需要这些资料啊！！！！！！</div> <div class="postmsg">xiexie 下了再去看！！！！！！！！！！！！！！</div> <div class="postmsg">无限的感激啊<br /> 呵呵<br /> 多多感谢啦<br /> 再说次谢谢哈</div> <div class="postmsg">无限的感激啊<br /> 呵呵<br /> 多多感谢啦<br /> 再说次谢谢哈</div> <div class="postmsg">支持一下 感谢楼主分享<br /> 谢谢 <img src="static/image/smiley/default/em20.gif" smilieid="49" border="0" alt="" /> <img src="static/image/smiley/default/em20.gif" smilieid="49" border="0" alt="" /> <img src="static/image/smiley/default/em20.gif" smilieid="49" border="0" alt="" /></div> <div class="postmsg">学习学习，好好学学！！！！<img src="static/image/smiley/default/em20.gif" smilieid="49" border="0" alt="" /></div> <div class="postmsg">非常感谢楼主的帮忙...................</div> <div class="postmsg">学习学习,谢谢楼住,您辛苦了.<img src="static/image/smiley/default/em23.gif" smilieid="52" border="0" alt="" /> <img src="static/image/smiley/default/em23.gif" smilieid="52" border="0" alt="" /> <img src="static/image/smiley/default/em23.gif" smilieid="52" border="0" alt="" /></div> <div class="postmsg">不错的资料哦！！！!!学习学习,谢谢楼住,您辛苦了.</div> <div class="postmsg">谢谢楼主！<img src="static/image/smiley/default/em20.gif" smilieid="49" border="0" alt="" /> <img src="static/image/smiley/default/em20.gif" smilieid="49" border="0" alt="" /> <img src="static/image/smiley/default/em20.gif" smilieid="49" border="0" alt="" /></div> <div class="postmsg">不错的资料哦！！！!!学习学习,谢谢楼住,您辛苦了.</div> <div class="postmsg">激光扩束镜原理<br /> [B]激光扩束原理[/B]<br /> 衍射<br /> 通常我们以光束的发散参数作为完美的高斯激光束的特征。发散是指光波在其空间传播过程中以一定角度展开。甚至完美的没有任何异常的光线也会由于衍射效应经历某些光束的发散。衍射是指光线在被不透明的物体，比如刀锋切断的时候产生的弯曲效应。展开（spreading）产生于在切断的边缘发出的次级波面阵。这些次级波和主波会发生干涉，同时相互也会产生干涉，在某些时候就会形成复杂的衍射图案。<br /> 衍射使得完美的校准光束或者能够将光束聚焦到无限小的点成为不可能。幸运的是衍射的效果是能够被计算的。因此存在着可以预知对于任何衍射极限的透镜光束被准直的程度和光斑大小的理论。<br /> 我们现在考虑一束这样由低功率TEM00气体激光器产生的光束，光腰为S0。这样我们就能够假定它能够达到衍射极限同时能够不用考虑任何热透镜效应。它将会显现出由于衍射引起的光腰的弯曲，或者说展开效应：<br /> S(x)=S0[1+(λx/πS0&sup2;)&sup2;]&frac12;<br /> 在这里x是指离开光源的距离，λ是指激光波长，如果λx/πS0&sup2;&raquo;1，那么：<br /> S(x)≈λx/πS0&sup2;<br /> 利用这个近似值，我们可以写出光束由于衍射发散的角度：<br /> θ= S(x)/x=λ/πS0<br /> θ我们都知道指的是远场发散角。<br /> 改善发散角<br /> 光束的远场发散定义了一个给定光束直径最好的准直效果。它也说明了光束的零发散角或者说最好的准直是不可能达到的，因为要做到这些需要有无穷大的光束直径。但是这个等式也表明了改善发散的可能性。<br /> 考虑一个已经准直的光束，发散角为θ光腰为S0，我们可以看到如果光束直径能够增大，远场发散角将会减小。这就是扩大光束的优点所在。另外，小的发散能够使高斯光束聚焦得更好。为了实现这些改善，在这里我们将描述几种对准直光束扩束的方法。<br /> 伽利略扩束镜<br /> 最通用的扩束镜类型起源于伽利略望远镜，通常包括一个输入的凹透镜和一个输出的凸透镜。输入镜将一个虚焦距光束传送给输出镜。一般的低倍数的扩束镜都用该原理制造，因为它简单、体积小、价格也低。一般的尽可能的被设计为小的球面相差，低的波前变形和消色差。它的局限性在于不能容纳空间滤波或者进行大倍率的扩束。<br /> 开普勒扩束镜<br /> 事实上在需要空间滤波或者进行大倍率的扩束的时候，人们一般使用开普勒设计的望远镜。开普勒望远镜一般有一个凸透镜作为输入镜片，把实焦距聚焦的光束发送到输出元件上。另外，可以通过在第一个透镜的焦点上放置小孔来实现空间滤波。</div> <div class="postmsg">多谢共享!!<br /> <br /> <br /> 顶 顶 顶</div> <div class="postmsg">感谢楼主倾情奉献，<img src="static/image/smiley/default/handshake.gif" smilieid="17" border="0" alt="" /> <img src="static/image/smiley/default/handshake.gif" smilieid="17" border="0" alt="" /> <img src="static/image/smiley/default/handshake.gif" smilieid="17" border="0" alt="" /></div> <div class="postmsg"><img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /><img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /><img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" />不错的资料哦！！！</div> <div class="postmsg">瞧瞧，看看是什么好东东。。。。。。。。。。</div> <div class="postmsg">非常受用，感谢楼主无私奉献精神，顶</div> <div class="postmsg">我是新手，请允许我跟两次帖子，灌桶水</div> <div class="postmsg"><strong> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=444773&ptid=68448" target="_blank">8#</a> <i>Nd:YAG</i> </strong><br /> <br /> 请问贵公司对低噪高效的激光电源是否有需求呢？可以站内短信我，谢谢</div> <div class="postmsg">应该是不错的资料哦，谢谢楼主了哦</div> <div class="postmsg">学习学习，好好学学 下来看看。</div> <div class="postmsg">顶了再看.........................</div> <div class="postmsg">顶了再看.........................</div> <div class="postmsg">henhao ,xia l kankan.duoxie banzhu</div> <div class="postmsg">是否是全的。<br /> 。。。。<br /> 。。。。<br /> 。。。。</div> <div class="postmsg">下了，很有用处。全面的基本知识和慨念。</div> <div class="postmsg">准备好好研究学习了。。。。。。</div> <div class="postmsg">hso dongdong a ! ...................</div> <div class="postmsg">what is the matter?<br /> where is my money, I lost more than 16 Jinbi download this stuff</div> <div class="postmsg">谢谢,正在找呢?希望您能看到我的新帖,给我一些帮助谢谢 !!!!<br /> <br /> 我们在和APPLE，合作制造一款手机，是不锈钢产品，材质SUS304,需将两件叠焊,厚度都是0.5MM.焊接过程中没有保护气体.焊接机使用ROFIN 90W脉冲焊接机..焦距25MM.我们使用焦点焊接.. 大家都知道会有焊渣飞溅.焊渣会粘在镜头上,很难用擦镜纸擦掉,时间长了就会造成焊接品质下降,需要将镜头抛光,但也只能抛光3次.就会报废<br /> 我想请教,...........<a href="http://bbs.oecr.com/thread-96937-1-1.html............" target="_blank">http://bbs.oecr.com/thread-96937-1-1.html............</a>请顺便顶下帖去啊.谢谢!!!</div> <div style="height200px;"></div> <ul class="xl xl2 cl" style="border-top: 1px #cccccc dashed;margin:5px 0 ;padding-top:5px"> <dl><b> 同一主题资料:</b></dl><dl class='icon'><img src="static/image/filetype/rar.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=25760" title="薄膜光学1.rar">薄膜光学1.rar</a> <font color="#AAAAAA">(1.11 MB)</font> </dl> <dl class='icon'><img src="static/image/filetype/rar.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=25761" title="薄膜光学2.rar">薄膜光学2.rar</a> <font color="#AAAAAA">(1.39 MB)</font> </dl> <dl class='icon'><img src="static/image/filetype/rar.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=25762" title="薄膜光学3.rar">薄膜光学3.rar</a> <font 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