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class="bm_c xld"> <b>激光从光纤射出，是不是可以看做是点光源:</b><div class="postmsg">这方面的资料从哪里看，有没有了解的</div> <div class="postmsg">理论上不是，但是你又的确可以把它看成点光源.</div> <div class="postmsg">实际使用过程中就当成了点光源在用了</div> <div class="postmsg">如果是点光源则可以描述成点扩散函数，从光纤口得到的能量分布，顶部宽平。点光源可以得到能量与距离平方成反比关系，可是光纤数值孔径NA比较小，他不能。可以把他看成是很远处1群很密的星星的效果，1个星星那是点光源，一群就不是。问题是应用时的定义，假如投影屏是许多光纤组成，那么其中任意一个都是点光源。</div> <div class="postmsg">我觉得不能看作点光源，一般情况，视场设置以光纤芯的半径作为物高，然后把孔径设定为NA。</div> <div class="postmsg"><div class="quote"><blockquote><font size="2"><font color="#999999">wang 发表于 2012-7-17 14:56</font> <a href="http://forum.oecr.com/forum.php?mod=redirect&goto=findpost&pid=1024958&ptid=252198" target="_blank"><img id="aimg_w5m51" 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></font><br /> 理论上不是，但是你又的确可以把它看成点光源.</blockquote></div><br /> 你好，如果将其看作点光源，那么激光从光纤出射后，其传播方式是看成几何光学传播，以直线形式传播还是以高斯形式传播？如果以高斯形式传播，看作是点光源，那么岂不是没有束腰？其远场发散角为数值孔径中THETA角。如果这样高斯近似，其进场传播轨迹是怎么样呢？如果看成几何光学传播，那么虽然数值孔径中THETA角不大，但是激光从光纤输出后就是发散的，连瑞利准直距离都没有。<br /> </div> <div class="postmsg"><div class="quote"><blockquote><font size="2"><font color="#999999">wang 发表于 2012-7-17 14:56</font> <a href="http://forum.oecr.com/forum.php?mod=redirect&goto=findpost&pid=1024958&ptid=252198" target="_blank"><img id="aimg_VZm9K" 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></font><br /> 理论上不是，但是你又的确可以把它看成点光源.</blockquote></div><br /> 你好，如果将其看作点光源，那么激光从光纤出射后，其传播方式是看成几何光学传播，以直线形式传播还是以高斯形式传播？如果以高斯形式传播，看作是点光源，那么岂不是没有束腰？其远场发散角为数值孔径中THETA角。如果这样高斯近似，其进场传播轨迹是怎么样呢？如果看成几何光学传播，那么虽然数值孔径中THETA角不大，但是激光从光纤输出后就是发散的，连瑞利准直距离都没有。</div> <div class="postmsg"><div class="quote"><blockquote><font size="2"><font color="#999999">michael2012 发表于 2012-7-20 08:57</font> <a href="http://forum.oecr.com/forum.php?mod=redirect&goto=findpost&pid=1025588&ptid=252198" target="_blank"><img id="aimg_Gh5r0" 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></font><br /> 实际使用过程中就当成了点光源在用了</blockquote></div><br /> 你好，如果将其看作点光源，那么激光从光纤出射后，其传播方式是看成几何光学传播，以直线形式传播还是以高斯形式传播？如果以高斯形式传播，看作是点光源，那么岂不是没有束腰？其远场发散角为数值孔径中THETA角。如果这样高斯近似，其进场传播轨迹是怎么样呢？如果看成几何光学传播，那么虽然数值孔径中THETA角不大，但是激光从光纤输出后就是发散的，连瑞利准直距离都没有。</div> <div class="postmsg"><div class="quote"><blockquote><font size="2"><font color="#999999">lilook 发表于 2012-7-22 14:24</font> <a href="http://forum.oecr.com/forum.php?mod=redirect&goto=findpost&pid=1026052&ptid=252198" target="_blank"><img id="aimg_zCVEV" 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></font><br /> 我觉得不能看作点光源，一般情况，视场设置以光纤芯的半径作为物高，然后把孔径设定为NA。</blockquote></div><br /> 您好，您这样设置和我在zemax中做类似的工作时 是同样的设置，但是我心里有一个问题如果这样设置，就等于说认为激光从光纤输出后，直接以数值孔径theta角发散，不符合激光传输特性吧？毕竟在近场中高斯光还是不能等价几何光学吧？</div> <div class="postmsg">不知道在哪看过，激光经光纤传输后，即不是高斯光束(连多模也称不上)，也是不几何光学。就是什么混合模，通常是按几何光学处理。因为工业上应用，得到大概的结论就可以了。</div> <div class="postmsg">我在楼说简单了，造成理解障碍，现在从物面、传播、聚焦的像面三处分别进行对比。<br /> 点光源是无限小的点，为了比较方便，假定点光源直径0.01mm，这时它的能量分布是一个单峰正态分布形状，<br /> 再看光纤，把光纤出射端面当物面，为了使问题简化仅谈单芯的情况，在整个出射端表面都有光存在，他等于光纤直径，通信的光纤直径小，能量传输的光纤直径比较大，假定芯径0.2mm，我曾经用过0.9的，将光投影到墙上可以明显的看到一个圆斑，由此可以推断出射面的能量分布一定是顶部宽平，其宽度稍小于芯径的能量分布形状，它相当于小的面光源。<br /> <br /> 看传播，点光源，是向整个球面发散光的，在某一立体角上其能量与距离的平方成反比。<br /> 光纤只在数值孔径范围发散光，发散角比较小，其能量与距离的关系，这个我不知道，但我知道只有点光源是能量与距离的平方成反比。<br /> 这里我有一点不明白，光是直线传播的，怎么激光会不是，是按高斯方式传播，那是什么路径。好像混了，应当也是直线传播，只是那个些根光线带的能量不同，他呈高斯分布，中心亮些，普通光中心和边缘一样亮。<br /> <br /> 归根结底是经镜头聚焦后二者焦斑有何不同，还有优化选择问题，这个才有意义。<br /> <br /> </div> <div class="postmsg">转个贴：<br /> 激光光束传输的计算公式，适用于平顶型的高斯公式！ <br /> <br /> 摘要:该文从Collins 公式出发,对平顶高斯光束的传输特性进行了研究,推导出了其通过ABCD 光学系统的解析传输公式,并且给出了计算例子. 研究表明:N 阶平顶高斯光束通过ABCD 光学系统后的传输可以表示为N 个合流超几何函数(库默尔函数) 的叠加. <br /> <br /> </div> <div class="postmsg">看光纤直径了，很小的话当然可以看做电光源</div> <div class="postmsg">如果只是普通照明使用，可以看作点光源。</div> <div style="height200px;"></div> </div> </div> </div> </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" title="主办单位：武汉焦点光学技术有限公司" target="_blank" >焦点光学</a><span class="pipe">|</span><a href="http://www.oecr.com" target="_blank">光电工程师社区</a> ( <a href="http://beian.miit.gov.cn/" target="_blank">鄂ICP备17021725号-1</a> <a 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