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onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_87122_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>超快激光脉宽测量1.jpg</strong> <em class="xg1">(82.45 KB, 下载次数: 47)</em></p> <p> <a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=ODcxMjJ8OGQxZGU1ZmZ8MTc2NjA0NDUyM3wwfDI2NTIzMw%3D%3D&nothumb=yes" target="_blank">下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_87122" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=87122&handlekey=savephoto_87122">保存到相册</a> </p> <p class="xg1 y">2015-1-15 14:23 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <br /> 2. 实物图<br /> <ignore_js_op> <img id="aimg_87123" aid="87123" src="static/image/common/none.gif" zoomfile="data/attachment/forum/201501/15/1423578ouss5cch16z8t6g.jpg" file="data/attachment/forum/201501/15/1423578ouss5cch16z8t6g.jpg" class="zoom" 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file="data/attachment/forum/201501/15/1423577f909hhfpmmp9zi4.jpg" class="zoom" onclick="zoom(this, this.src, 0, 0, 0)" width="98" id="aimg_87124" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_87124_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>超快激光脉宽测量3.jpg</strong> <em class="xg1">(76.22 KB, 下载次数: 46)</em></p> <p> <a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=ODcxMjR8YjMzYzIzMjV8MTc2NjA0NDUyM3wwfDI2NTIzMw%3D%3D&nothumb=yes" target="_blank">下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_87124" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=87124&handlekey=savephoto_87124">保存到相册</a> </p> <p class="xg1 y">2015-1-15 14:23 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <br /> 两束混合光经聚焦镜反射到SHG CRYSTAL 后将SHG crystal 作为瞬间响应非线性光学门开关将其作为门函数得出其乘积。<br /> FROG系统通过SHG Crystal 来控制<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>的波长<br /> 以450nm —1800nm为例， 需采用三块<a href="http://material.oecr.com" target="_blank" class="relatedlink">晶体</a>和两个光谱仪来覆盖整个波段。<br /> 1. SHG Crystal , thin55 degree BBO 20 microns thick for 440 nm - 550 nm<br /> 2. SHG Crystal, thin.34 degree BBO 30 micron thick for 550 nm - 1000 nm.<br /> 3. SHG Crystal, standard BBO crystal, mounted. 100um thick or thicker. Any angle, Used in the IR(1000nm - 1800nm)<br /> <br /> 所测脉宽越短时，其SHG晶体则需越薄，为的是减少它在SHG中的迟滞时间。<br /> <font color="#ffffff">www.guruntech.com</font><br /> 晶体是波长越长厚度越厚，波长越短厚度越薄。 <br /> <br /> 光谱仪<br /> HR2000+ 450nm-1200 nm<br /> HR2000+ 1200nm-1800nm<br /> <ignore_js_op> <img id="aimg_87125" aid="87125" src="static/image/common/none.gif" zoomfile="data/attachment/forum/201501/15/142359ryvpbtypkhvfrbs5.jpg" file="data/attachment/forum/201501/15/142359ryvpbtypkhvfrbs5.jpg" class="zoom" onclick="zoom(this, this.src, 0, 0, 0)" width="98" id="aimg_87125" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_87125_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>超快激光脉宽测量4.jpg</strong> <em class="xg1">(72.95 KB, 下载次数: 43)</em></p> <p> <a href="http://bbs.oecr.com/forum.php?mod=attachment&aid=ODcxMjV8Y2UzMTkwNzB8MTc2NjA0NDUyM3wwfDI2NTIzMw%3D%3D&nothumb=yes" target="_blank">下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_87125" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=87125&handlekey=savephoto_87125">保存到相册</a> </p> <p class="xg1 y">2015-1-15 14:23 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <br /> 图中的伺服是用来控制光路的delay时间τ，系统中其所采用的算是为<br /> <br /> <br /> 计算出信号Esig ( t ,τ) ,对其求傅里叶变换得到频域信号Esig (ω, τ) , 然后用实验测得的I FROG(ω,τ) 代替信号Esig (ω,τ) 的幅度得到新的Esig (ω,τ) ,经反傅里叶变换得到新的Esig ( t ,τ)应用一定的限定条件,由新的Esig ( t ,τ) 计算出新的E( t) 作为下一次迭代的初值。重复这个过程,直到FROG图形误差达到一个可以接受的值。<br /> <br /> FROG缺点：对于SHG FROG法, 在低于10f s 光脉冲的<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>中,同SHG法一样,受到非线性晶体有限相位匹配带宽的限制<br /> </td></tr></table> <div class="ptg mbm mtn"> <a title="测量" href="misc.php?mod=tag&id=1362" target="_blank">测量</a>, <a title="激光" href="misc.php?mod=tag&id=78" target="_blank">激光</a></div> </div> <div id="comment_1140019" class="cm"> </div> <div 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['87125','87124','87123','87122']; attachimggroup(1140019); var aimgfid = 0; </script> </div><div class="postaaa posta1" id="post_1140329" ><table id="pid1140329" class="plhin" summary="pid1140329" cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar1140329" class="pls favatar"> <a name="lastpost"></a><div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-145484.html" target="_blank" class="xw1" style="color: #FF00CC">光粒网-Kelly</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo1140329" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo1140329_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-145484.html" target="_blank" class="xi2" style="color: #FF00CC">光粒网-Kelly</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=145484&do=profile" target="_blank" class="xi2">3719</a></dd> </dl><div 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