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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=62" 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">脉冲激光器的能量换算 </h1> <p class="xg1"> 时间：2016-5-18 09:39<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(2685)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=4412&idtype=aid" title="查看全部评论"><em id="_commentnum">6</em></a>王国力</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=62" 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>脉冲激光器的发射激光是不连续，一般以高重频脉冲间隔发射。发射能量以功的单位焦耳(J)计，即每次脉冲做功多少焦耳。连续激光器发射的能量以功率单位瓦特(W)计量，即每秒钟做功多少焦耳，表示单位时间内做功多少。瓦 ...</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>脉冲<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>器的发射激光是不连续，一般以高重频脉冲间隔发射。发射能量以功的单位焦耳(J)计，即每次脉冲做功多少焦耳。连续激光器发射的能量以功率单位瓦特(W)计量，即每秒钟做功多少焦耳，表示单位时间内做功多少。<font color="#008000"><b>瓦和焦耳的关系：1W=1J/秒。</b></font> </div><div><br></div><div> 一台脉冲激光器，脉冲发射能量是1焦耳/次，脉冲频率是50Hz，则每秒钟发射激光50次，每秒钟内做功的平均功率为：50X 1焦耳=50焦耳，所以，平均功率就换算为50瓦。 </div><div><br></div><div>再举例说明<b><font color="#008000">峰值功率的计算</font></b>：</div><div><br></div><div>一台绿光脉冲激光器，脉冲能量是0.14mJ/次，每次脉宽20ns, 脉冲频率100kHz，</div><div><b><font color="#f0c000"> </font></b><span style="line-height: 1.8em;"><b><font color="#f0c000">平均功率为</font></b>：0.14mJ X 100k=14J/s=14W，即平均功率为14瓦；</span></div><div><span style="line-height: 1.8em;"><font color="#f0c000"><b> </b></font></span><span style="line-height: 1.8em;"><font color="#f0c000"><b>峰值功率是：每次脉冲能量与脉宽之比</b></font>，即 </span><span style="line-height: 1.8em;">峰值功率：0.14mJ/20ns=7000W=7kW, 峰值功率为7千瓦。 </span></div><div><span style="line-height: 1.8em;"><br></span></div><div><u><font color="#0000f0">要想知道镜片的脉冲激光损伤阈值是否在承受极限内，既要计算脉冲激光的峰值功率，也要计算脉冲激光的平均功率，综合考虑。 </font></u></div><div><br></div><div>如某ZnSe镜片的激光损伤阈值时是500MW/cm2, 使用在一台脉冲激光器中，脉冲激光器的脉冲能量是10J/cm2，脉宽10ns，频率50kHz。 </div><div><br></div><div>首先，计算平均功率： 10J/cm2 X 50kHz =0.5MW/cm2 <span style="line-height: 1.8em;">其次，再计算峰值功率：10J/cm2 / 10ns = 1000MW/cm2 </span></div><div><span style="line-height: 1.8em;"><br></span></div><div>从脉冲激光器的平均功率看，该镜片是能承受不被损伤的，但从脉冲激光器的峰值功率看，是大于该镜片的激光损伤阈值的。所以，综合判断，该ZnSe镜片不宜用于此脉冲激光器。</div><div><br></div><div>如果有条件，对脉冲激光器镜片，应当分别<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>平均功率和峰值功率的激光损伤阈值。 </div><div><br></div><div>•Ave. Power ： 平均功率 </div><div>•Pulse energy ： 脉冲能量 </div><div>•Pulse Width： 脉宽 </div><div>•Peak Power: 峰值功率 </div><div>•Rep. Rate ： 脉冲频率 </div><div>•ps： 皮秒，10-12 S </div><div>•ns： 纳秒，10-9S </div><div>•M: 兆，106 </div><div>•J: 焦耳 </div><div>•W: 瓦</div><div style="text-align: center;"><p><a href="data/attachment/portal/201605/18/093554ta85zseuhak88clh.jpg" target="_blank"><img src="data/attachment/portal/201605/18/093554ta85zseuhak88clh.jpg"></a></p><p>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<a href="http://club.oecr.com" target="_blank" class="relatedlink">社区</a>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。</p></div></td></tr></table> <!--[diy=diycontentbottom]--><div id="diycontentbottom" class="area"></div><!--[/diy]--> <script src="data/cache/home.js?eOg" type="text/javascript"></script> <div id="click_div"><table cellpadding="0" cellspacing="0" class="atd"> <tr><td> <a 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<span class="xg1 xw0">2016-5-19 09:26</span> </dt> <dd>转发微博</dd> </dl><a name="comment_anchor_6138"></a> <dl id="comment_6138_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(6138, '4412');">引用</a> </span> <a href="http://club.oecr.com/space-uid-29735.html" class="xi2 xw1" c="1">lijingcow</a> <span class="xg1 xw0">2016-5-18 15:21</span> </dt> <dd>围观 围观 沙发在哪里！！！</dd> </dl><a name="comment_anchor_6136"></a> <dl id="comment_6136_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(6136, '4412');">引用</a> </span> <a href="http://club.oecr.com/space-uid-29592.html" class="xi2 xw1" c="1">HenryGod</a> <span class="xg1 xw0">2016-5-18 14:21</span> </dt> <dd>好，很好，非常好！</dd> </dl><a name="comment_anchor_6134"></a> <dl id="comment_6134_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(6134, '4412');">引用</a> </span> <a href="http://club.oecr.com/space-uid-30751.html" class="xi2 xw1" c="1">mikao</a> <span class="xg1 xw0">2016-5-18 13:21</span> </dt> <dd>LZ文章给力，给回复下吧</dd> </dl><a name="comment_anchor_6129"></a> <dl id="comment_6129_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(6129, '4412');">引用</a> </span> 游客 <span class="xg1 xw0">2016-5-18 10:56</span> </dt> <dd>转发微博</dd> </dl><a name="comment_anchor_6126"></a> <dl id="comment_6126_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(6126, '4412');">引用</a> </span> <a href="http://club.oecr.com/space-uid-116770.html" class="xi2 xw1" c="1">love99</a> <span class="xg1 xw0">2016-5-18 09:51</span> </dt> <dd>不错的主题，谢谢楼主分享。</dd> </dl></div> </div> <!--[diy=diycontentcomment]--><div id="diycontentcomment" class="area"></div><!--[/diy]--> </div> 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