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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">主动调Q光纤激光器有望提高激光雷达探测精度 </h1> <p class="xg1"> 时间：2016-9-28 09:10<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1331)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=4859&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>探测精度可谓是激光雷达（LIDAR）系统的命脉所在，高精度一直是LIDAR技术不渝的追求。对于多普勒相干激光雷达，提高探测精度的有效途径之一便是实现其发射源的长脉冲输出。 在采用注入锁频技术的激光雷达发射源中 ...</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> 探测精度可谓是<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>雷达（LIDAR）系统的命脉所在，高精度一直是LIDAR技术不渝的追求。对于多普勒相干激光雷达，提高探测精度的有效途径之一便是实现其发射源的长脉冲输出。</div><div> 在采用注入锁频技术的激光雷达发射源中，脉冲宽度主要受从激光器(slave laser)控制。脉冲光纤环形激光器具有单向运行、长脉冲输出的特点，因此可作为理想的从激光器在注入锁频激光器中使用。</div><div> 目前，在2 μm波段有关脉冲光纤环形激光器的报道多采用被动调Q方式。被动调Q激光器具有结构简单的优点，但其脉冲重复率和脉冲宽度往往不可控，这导致其不适于在注入锁频技术中使用。</div><div> 为了避免被动调Q技术的上述缺陷，哈尔滨工业大学航天学院鞠有伦教授课题组采用主动调Q方式，利用自由空间声光调制器实现了稳定工作在2 μm波段的掺铥光纤环形激光器。相关研究成果发表在Chinese Optics Letters2016年第9期上（W. Liu, et al.,Actively Q-switched ring Tm-dopedfiber laser with free space structure ）。</div><div><br></div><div style="text-align: center;"><p><a href="data/attachment/portal/201609/28/090842mzdgarbhrbwx5zrx.jpg" target="_blank"><img src="data/attachment/portal/201609/28/090842mzdgarbhrbwx5zrx.jpg"></a></p></div><div> 图片说明：基于自由空间结构的主动调Q掺铥光纤环形激光器实验装置示意图。在100 Hz重复频率下，腔长为12 m时，获得了单脉冲能量为150 μJ、脉冲宽度为382 ns的脉冲激光输出。</div><div> 与被动调Q技术相比，主动调Q激光器在重复频率、脉冲宽度等激光器性能上都可得到较好的稳定控制。而声光调制器是实现主动调Q的惯常选择，它主要有光纤耦合式和自由空间式两种类型。考虑到自由空间声光调制器在2 μm波段具有更高的损伤阈值，更有利于实现高能量脉冲输出，该课题组利用其搭建了掺铥光纤环形激光器。</div><div> 在100 Hz重复频率下，腔长为6.68 m时，这一激光器系统获得了单脉冲能量150 μJ、脉冲宽度207 ns的脉冲激光输出；在将激光器的腔长通过传导光纤增加至12 m后，在相同脉冲能量下，输出脉冲宽度达到了382 ns。</div><div> 鞠有伦教授表示，该项研究结果初步解决了在2 μm波段注入锁频激光器中从激光器输出脉冲宽度较窄的问题。下一阶段的工作将对掺铥光纤环形激光器各项参数进一步优化，使其最终有望应用于多普勒相干激光雷达系统。<a href="data/attachment/portal/201609/28/090922xirrmrh20zclwzrl.png" target="_blank" style="line-height: 1.8em;"><img 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name="comment_anchor_8472"></a> <dl id="comment_8472_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(8472, '4859');">引用</a> </span> <a href="http://club.oecr.com/space-uid-43284.html" class="xi2 xw1" c="1">fenger0907</a> <span class="xg1 xw0">2016-9-28 14:53</span> </dt> <dd>沙发？？？</dd> </dl><a name="comment_anchor_8467"></a> <dl id="comment_8467_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(8467, '4859');">引用</a> </span> <a href="http://club.oecr.com/space-uid-43945.html" class="xi2 xw1" c="1">GG_009</a> <span class="xg1 xw0">2016-9-28 12:23</span> </dt> <dd>我也是坐沙发的</dd> </dl><a name="comment_anchor_8462"></a> <dl id="comment_8462_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(8462, '4859');">引用</a> </span> <a 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