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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=61" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">激光实验：1.46nm波长原子内壳层X射线如何产生 </h1> <p class="xg1"> 时间：2016-11-8 10:30<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1840)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=5023&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=61" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>今天为大家分享的是一个激光实验，1.46nm波长原子内壳层X射线怎么产生？本文中为大家进行了详细的介绍。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> 1.46nm波长原子内壳层X射线怎么产生？今天光电工程师<a href="http://club.oecr.com" target="_blank" class="relatedlink">社区</a>为您分享一个<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>实验，<span style="line-height: 25.2px;">X射线自由<a href="http://electronic.oecr.com" target="_blank" class="relatedlink">电子</a>激光的出现为原子X射线激光的产生提供了很好的泵浦源。应用X射线自由电子激光来电离原子内K壳层电子，进而实现了原子能级间的粒子数反转，并且获得了波长为1.46nm(对应于849eV的单光子能量)的氖离子Kα受激辐射光。</span><span style="line-height: 1.8em;">请有兴趣的光学爱好者们看看下面的内容吧。</span></div><div><br></div><div> 本实验中所得到的原子X射线激光脉冲，无论是在更短波长还是更高强度等方面，都优于以往所见报道的实验成果。另外与X射线自由电子激光相比，该原子X射线激光具有更为优越的单色性、波长稳定性和时间相干性。该原子X射线激光可以被应用于高分辨光谱学和X射线非线性光学等领域内。 <span style="line-height: 1.8em;">实验装置如下图(a)中所示，由直线电子加速器相干光源(LCLS)输出的X射线自由电子激光(XFEL)单光子能量为960eV。X射线脉冲被聚焦至压强约为500torr的氖气中，焦斑半径为1～2μm。单脉冲能量为0.02～0.27mJ，而脉冲宽度为40～80fs，于是聚焦后的光场强度可以达到2×1017Wcm-2。 </span></div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201611/08/102635m1e1n1cnzxixczn3.jpg" target="_blank"><img src="data/attachment/portal/201611/08/102635m1e1n1cnzxixczn3.jpg"></a></p></div><div><span style="line-height: 1.8em;"><br></span></div><div><span style="line-height: 1.8em;"> 光栅光谱仪探测结果如图(b)中所示，其中较宽偏暗的谱线为透过的X射线自由电子激光。而比较亮的细谱线则为部分氖离子的Kα辐射光，其单光子能量为849eV。其产生机理如图(c)所示，由于K壳层电子的光电离，在1s12s22p6和1s22s22p5两能级间实现了粒子数反转，从而使Kα受激辐射光放大成为可能。 </span></div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201611/08/102701b2fsm9s9i2gzw2gz.jpg" target="_blank"><img src="data/attachment/portal/201611/08/102701b2fsm9s9i2gzw2gz.jpg"></a></p></div><div><br></div><div> 从上面的图中我们可以看到三次实验结果所用入射脉冲能量均约为0.25mJ，而入射单光子能量略有变化。透射的X射线自由电子激光与Kα受激辐射光的衰减因子分别为2.5×103和2。 由于受到光谱仪分辨率的限制，测得Kα辐射光谱的半高全宽约为2eV。Kα辐射主谱峰两边伴生的旁瓣很可能是由光谱仪光栅产生的鬼线。 </div><div><br></div><div> 各位光学爱好者们可以在光电<a href="http://bbs.oecr.com" target="_blank" class="relatedlink">论坛</a>中的激光版块讨论一下这个实验，您有什么样的想法都可以在我们的论坛中发表。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201611/08/103009g57w02i05lwlc0wx.jpg" target="_blank"><img src="data/attachment/portal/201611/08/103009g57w02i05lwlc0wx.jpg"></a></p><p style="text-align: center;"><br></p><p style="text-align: center;"><span style="line-height: 25.2px;">欢迎关注光电<a href="http://news.oecr.com" target="_blank" class="relatedlink">资讯</a>微信公众号，每天将由光电工程师社区网站(oecr.com)编辑团队为您精选行业动态，科技资讯，技术解析，光电<a href="http://www.oecr.com/portal.php?mod=list&catid=62" target="_blank" class="relatedlink">科普</a>等精彩内容，欢迎交换友情链接</span><span 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</dl><a name="comment_anchor_9297"></a> <dl id="comment_9297_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(9297, '5023');">引用</a> </span> <a href="http://club.oecr.com/space-uid-15700.html" class="xi2 xw1" c="1">norlat</a> <span class="xg1 xw0">2016-11-8 21:58</span> </dt> <dd>神奇的文章。</dd> </dl><a name="comment_anchor_9291"></a> <dl id="comment_9291_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(9291, '5023');">引用</a> </span> <a href="http://club.oecr.com/space-uid-67413.html" class="xi2 xw1" c="1">huxd03</a> <span class="xg1 xw0">2016-11-8 18:58</span> </dt> <dd>怎么才能在这里发布信息呢？</dd> </dl><a name="comment_anchor_9277"></a> <dl id="comment_9277_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(9277, '5023');">引用</a> </span> 游客 <span class="xg1 xw0">2016-11-8 12:08</span> </dt> <dd>转发微博</dd> </dl><a name="comment_anchor_9274"></a> <dl id="comment_9274_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(9274, '5023');">引用</a> </span> <a href="http://club.oecr.com/space-uid-98762.html" class="xi2 xw1" c="1">stefiane</a> <span class="xg1 xw0">2016-11-8 11:28</span> </dt> <dd>oecrcom，搜索微信直接加就好了。</dd> </dl></div> </div> <!--[diy=diycontentcomment]--><div id="diycontentcomment" class="area"></div><!--[/diy]--> </div> <div class="sd pph"> <div class="drag"> <!--[diy=diyrighttop]--><div id="diyrighttop" class="area"><div id="frameG07e2m" class="sy_ltdr frame move-span cl frame-1"><div class="frame-title title"><span class="titletext">社区成员推荐</span></div><div id="frameG07e2m_left" class="column frame-1-c"><div id="frameG07e2m_left_temp" class="move-span temp"></div><div id="portal_block_925" class="cl_block_bm block move-span"><div id="portal_block_925_content" 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