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<strong> <a href="http://bbs.oecr.com/thread-91152-1-1.html" id="postnum583217" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon583217" src="static/image/common/online_member.gif" /> <em id="authorposton583217">发表于 2009-8-16 16:22:39</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=91152&page=1&authorid=95675" rel="nofollow">只看该作者</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=91152&extra=&ordertype=1" class="show">倒序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 583217);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_583217"> Consider the energy levels involved in the operation of a He-Ne laster. Consider the lifetimes of the various levels. Which should be long, which sould be short. Explain why the actual laser transition is weak in luorescence by looking at the He-Ne laser rom the side. <br /> <br /> If the small signal gain of the Ne gas, with inversion, inside the laser medium is 0.003m-1, and the loss due to all processes is 0.001m-1. How much total gain would occur for a laser 300mm long.?<br /> <br /> If you shine a beam from a second laser tuned to resonance along the medium with an imput intensity of I(0)-what would the intensity be at the output?Does this result depend on I(0)? What would happen in the limit of very small I(0)? what will happen when we increase I(0)?(Consider the rate equations)</td></tr></table> </div> <div id="comment_583217" class="cm"> </div> <div id="post_rate_div_583217"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a href="http://club.oecr.com/home.php?mod=spacecp&ac=favorite&type=thread&id=91152&formhash=5d6dabc2" id="k_favorite" onclick="showWindow(this.id, this.href, 'get', 0);" onmouseover="this.title = $('favoritenumber').innerHTML + ' 人收藏'" title="收藏本帖"><i><img src="static/image/common/fav.gif" alt="收藏" />收藏<span id="favoritenumber" style="display:none">0</span></i></a> <a class="followp" href="home.php?mod=spacecp&ac=follow&op=relay&tid=91152&from=forum" onclick="showWindow('relaythread', this.href, 'get', 0);" title="转播求扩散"><i><img src="static/image/common/rt.png" alt="转播" />转播</i></a> <a class="sharep" href="home.php?mod=spacecp&ac=share&type=thread&id=91152" 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