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class="bm_c xld"> <b>激光器的结构分享:</b><div class="postmsg">激光器的结构分享</div> <div class="postmsg">好东西啊，可惜下不了，我也要能下。是个小小鸟，只有潜水的份了，不好意思。灌点水下资料。</div> <div class="postmsg">不要设置这个限制了，我们这些新手想看点资料都不容易，灌水还要挨骂的</div> <div class="postmsg">激光器的结构<br /> <br /> 激光器一般包括三个部分。 <br /> <br /> 1、激光工作介质 <br /> <br /> 激光的产生必须选择合适的工作介质，可以是气体、液体、固体或半导体。在这种介质中可以实现粒子数反转，以制造获得激光的必要条件。显然亚稳态能级的存在，对实现粒子数反转世非常有利的。现有工作介质近千种，可产生的激光波长包括从真空紫外道远红外，非常广泛。 <br /> <br /> 2、激励源 <br /> <br /> 为了使工作介质中出现粒子数反转，必须用一定的方法去激励原子体系，使处于上能级的粒子数增加。一般可以用气体放电的办法来利用具有动能的电子去激发介质原子，称为电激励；也可用脉冲光源来照射工作介质，称为光激励；还有热激励、化学激励等。各种激励方式被形象化地称为泵浦或抽运。为了不断得到激光输出，必须不断地“泵浦”以维持处于上能级的粒子数比下能级多。<br /> <br /> 3、谐振腔 <br /> <br /> 有了合适的工作物质和激励源后，可实现粒子数反转，但这样产生的受激辐射强度很弱，无法实际应用。于是人们就想到了用光学谐振腔进行放大。所谓光学谐振腔，实际是在激光器两端，面对面装上两块反射率很高的镜。一块几乎全反射，一块光大部分反射、少量透射出去，以使激光可透过这块镜子而射出。被反射回到工作介质的光，继续诱发新的受激辐射，光被放大。因此，光在谐振腔中来回振荡，造成连锁反应，雪崩似的获得放大，产生强烈的激光，从部分反射镜子一端输出。<br /> <br /> 下面以红宝石激光器为例来说明激光的形成。工作物质是一根红宝石棒。红宝石是掺入少许3价铬离子的三氧化二铝晶体。实际是掺入质量比约为0.05%的氧化铬。由于铬离子吸收白光中的绿光和蓝光，所以宝石呈粉红色。1960年梅曼发明的激光器所产用的红宝石是一根直径0.8cm、长约8cm的圆棒。两端面是一对平行平面镜，一端镀上全反射膜，一端有10%的透射率，可让激光透出。<br /> <br /> 红宝石激光器中，用高压氙灯作“泵浦”，利用氙灯所发出的强光激发铬离子到达激发态E3，被抽运到E3上的电子很快（～10－8s）通过无辐射跃迁到E2。E2是亚稳态能级，E2到E1的自发辐射几率很小，寿命长达10-3s，即允许粒子停留较长时间。于是，粒子就在E2上积聚起来，实现E2和E1两能级上的粒子数反转。从E2到E1受激发射的波长是694.3nm的红色激光。由脉冲氙灯得到的是脉冲激光，每一个光脉冲的持续时间不到1ms，每个光脉冲能量在10J以上；也就是说，每个脉冲激光的功率可超过10kW的数量级。注意到上述铬离子从激发到发出激光的过程中涉及到三条能级，故称为三能级系统。由于在三能级系统中，下能级E1是基态，通常情况下积聚大量原子，所以要达到粒子数反转，要有相当强的激励才行。 <br /> <br /> <br /> 可以有两种方法对激光器进行分类。一种是从激活媒质的物质状态面分类。这样可分为气体、液体、固体和半导体激光器。各类激光器各有特色。气体激光器的单色性强，如氦—氖激光器的单色性比普通光源要高1亿倍，而且气体激光器工作物质种类繁多，因此可产生许多不同频率的激光。但是，由于气体密度低，激光输出功率相应较小；固体激光器则正好相反，能量高，输出功率大，但工作物质种类较少，而且单色性差；液体激光器的最大特点是激光的波长可以在一定范围内连续变换。这种激光器特别适合于对激光波长有着严格要求的场合；半导体激光器的特点则是体积小，重量轻，结构简单，但输出的功率较小，单色性也较差。<br /> <br /> 另一种分类方式是按激活媒质的粒子结构来分类，可以分为原子、离子、分子和自由电子激光器。氦——氖激光器产生的激光是由氖原子发射的，红宝石激光器产生的激光则是由铬离子发射的。另外还有二氧化碳分子激光器，它的频率可以连续变化。而且可以覆盖很宽的频率范围。<br /> <br /> 各种激光器中激活媒质的方法也不尽相同。一般来说可分为三种方法：使用高强度的光，从带电源来的电子，以及较少用的第三种方法——核辐射。</div> <div class="postmsg">就是以上这些内容。<img src="static/image/smiley/default/em40.gif" smilieid="69" border="0" alt="" /> <img src="static/image/smiley/default/em40.gif" smilieid="69" border="0" alt="" /></div> <div class="postmsg">类似这样的帖子不知道发过多少遍了</div> <div class="postmsg">看不到啊楼主～～～～～～～<img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /></div> <div class="postmsg">看不到啊楼主～～～～～～～<img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /> <img src="static/image/smiley/default/cry.gif" smilieid="4" border="0" alt="" /></div> <div class="postmsg">每下载一个还扣钱啊？<br /> 真是即赚即花。可不爽也~~</div> <div class="postmsg">我也要顶到我能下。也别怪偶哈。别怪别怪。。。。。。</div> <div class="postmsg">顶了～～～·谢谢楼主～～～～～～</div> <div class="postmsg">没钱.没钱没钱顶到可以下为止,,,,</div> <div class="postmsg">没钱.没钱没钱顶到可以下为止,,,,</div> <div class="postmsg">有必要说什么"新手赚积分下载东西反复回复此贴，定期清理，其它贴灌水赚积分者死！"一句可以代表一个人的自身素质。就算别人灌水也是提升论坛的人气呀，哪个论坛最开始不都是这种运作方式的，还说什么死不死的，难怪此贴没有人回复了</div> <div class="postmsg">是很不爽啊 <br /> 有时候要花多倍经理才行 <br /> 顶你</div> <div class="postmsg">谢谢分享!!!<br /> <br /> 谢谢分享!!!<br /> <br /> 谢谢分享!!!</div> <div class="postmsg">这个其实也没啥好分享的吧，就那么几个部分<br /> 不过还是支持一下</div> <div class="postmsg">好的,谢谢楼主供资料分享!!!m31]</div> <div class="postmsg">先调查，再下载，这下上当了，呀呀<img src="static/image/smiley/default/em19.gif" smilieid="48" border="0" alt="" /></div> <div class="postmsg">能下呀，谢谢！楼主辛苦！！！！！！！！！！！！！！！</div> <div class="postmsg">真有提天性到的，支持支持啊。平时都忙于工作了，先想找点资料还要钱，FAINT</div> <div class="postmsg">顶一下！！顶一下！！顶一下！！顶一下！！</div> <div class="postmsg">再发点更详细的就好了。。。。。。。。。。。。。。。。。。。。</div> <div class="postmsg">我都知道啦。可对固体激光器了解还很少。</div> <div class="postmsg">来一点新鲜的<br /> 比如自由电子激光器</div> <div class="postmsg">呵呵 虽然说是老贴 但是还是要下下来看看 <br /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /></div> <div class="postmsg">好谢谢楼主的分享啊，努力攻读下</div> <div class="postmsg">dingyixia.......................</div> <div class="postmsg">好东西啊，可惜下不了，我也要能下。是个小小鸟，只有潜水的份了，不好意思。灌点水下资料。</div> <div class="postmsg">好东西啊，可惜下不了，我也要能下。</div> <div class="postmsg">浪费了我两个金钱，只好顶一下补回</div> <div class="postmsg">騙錢啊....我好不容易弄了2Y...結果被弄沒了.....</div> <div class="postmsg">哎 什么啊？激光器的结构<br /> ! y9 _6 ~& b% t$ m- f# s2 x& i+ i9 u4 j, C, d<br /> 激光器一般包括三个部分。 7 C</div> <div class="postmsg"><img src="static/image/smiley/default/dizzy.gif" smilieid="120" border="0" alt="" />帖子 太初级了！！！！！！</div> <div class="postmsg">我们这些新手想看点资料都不容易，灌水还要挨骂的</div> <div class="postmsg">垃圾。。。。。。。。。。。。。。。。。。。。。。。。。。。</div> <div class="postmsg">我新鸟，只能望而心叹了，这限制真是害人啊！</div> <div class="postmsg">不要望洋兴叹了，这种扫描贴还要加限制，楼主太不厚道</div> <div class="postmsg">下一个 呵呵</div> <div class="postmsg">这种东西也拿来赚钱？？？？？？？？？</div> <div class="postmsg"><strong> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=391538&ptid=61822" target="_blank">1#</a> <i>money168</i> </strong><br /> <br /> <br /> 我要！</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" 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