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<div class="bm"> <div class="bm_c xld"> <b>请教几个激光定义 激光损伤阈值是什么呀？:</b><div class="postmsg">学习激光原理遇到几个定义上的问题，什么叫激光损伤阈值呀？频率排斥效应是怎么一回事？谢谢各位的解答！</div> <div class="postmsg">不会吧？怎么没人回复呀？这两个定义找不到呀，不明白是什么意思</div> <div class="postmsg">单位是J/cm2。看是不是脉冲了，有的有时间。打坏腔镜的标准。人体也有这个，一般叫辐射。。。。<br /> <br /> 不知道你的频率排斥指的是啥，要是能级交叉，得看量子解简并的部分。问题太简短了，连个语境都没有。</div> <div class="postmsg">哦，谢谢啊，我就是做题的时候遇到了这么两个概念，学过激光原理但没见过这俩概念，只知道激光振荡阈值和频率牵引效应。。。</div> <div class="postmsg">频率排斥效应是不是指激光的模式竞争啊？说错了别仍鸡蛋啊<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /></div> <div class="postmsg">激光损伤阈值,前两天买能量计时遇到过这个术语,应该是探测头能承受的最高光强,既能量密度,单位J/CM2</div> <div class="postmsg">这里有详细的激光膜损伤阈值概念</div> <div class="postmsg">应该是材料受到激光辐射后受到不可逆损伤的最小能量密度吧，和材料有关</div> <div class="postmsg"><strong> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=416709&ptid=62558" target="_blank">7#</a> <i>smile_life1107</i> </strong><br /> <br /> <br /> 顶~~</div> <div class="postmsg"><font size="3"><font color="Blue"><font color="Navy">激光损伤域值，连续激光和脉冲激光应是不同的，连续激光以W瓦特来计，是功率的单位； <br /> 脉冲激光以J焦耳来计，是功的单位，它与脉宽有关。 <br /> <br /> 如我们将脉冲激光功换算成功率：10J/10ns=1000MW， 那么，脉冲激光相当的功率为1000MW <br /> <br /> 所以，如果一个反射镜的损伤阈值为 15J/cm2 @ 10ns, 那么相当于1000MW/cm2 <br /> <br /> 下面是常用的膜层损伤阈值对比： <br /> <br /> YAG Laser Mirror 15J/cm2 @ 10ns 1MW/cm2 <br /> YAG Laser Mirror 10J/cm2 @ 10ns 1MW/cm2 <br /> YAG Laser Lens 5J/cm2 @ 10ns 1MW/cm2 <br /> 100W CO2 2mm Beam 33uj/cm2 @10ns 3333W/cm2 <br /> 3KW CO2 25.4mm beam 6uj/cm2 @10ns 600W/cm2 </font></font></font></div> <div class="postmsg">15J/cm2 @ 10ns, 那么相当于1000MW/cm2 <br /> <br /> <br /> 为什么不是1500MW/cm2呢</div> <div class="postmsg">算那东西没用，买能量计的时候会给你配一个测试片，<br /> 如果表面膜层被激光打爆了，就是超出阈值了，<br /> 你只能通过扩束或者衰减来降低强度后再测量</div> <div class="postmsg">现在激光损伤的指标很多吧，有对激光介质的损伤有对光学薄膜的损伤有对眼睛的损伤，楼主问的是哪个？</div> <div class="postmsg">I got it finally, thank you for all your input.</div> <div style="height200px;"></div> </div> </div> </div> </div></div> </div> <!--autocomment filter by maxnum--> <div 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