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<table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_10624"> 日本Yokogawa电器公司和Matsushita电器工业有限公司联手开发出了一种紧凑型、低噪声的蓝色<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>光源。该光源由一个红外<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">半导体</a>激光器和一个二次谐波发生器(SHG)组成。它可理想地用于下一代光盘器件的开发和设计，即可在需要稳定光源的场合用作光探测器件。这个新型光源已由Yokogawa电器公司实现了商品化，并已开始销售。<br /> 该光发射组件由一个852 nm分布布喇格反射半导体激光器和一个光波导二次谐波发生器(SHG)组成，且分别由Yokogawa和Matsushita公司开发研制成(见图)。所用的半导体激光器有三个电极，可通过改变谐振腔的长度以及对DBR光学周期的调制来精确控制其发射波长。其波长转换效率为50%，高于常见的其他转换方式。SHG元件由掺氧化镁的铌酸锂制成，具有一种周期性的偏振转换结构。这种结构可使光波导中的光损耗降低并可形成较深的偏振转换层。<br /> <br /> 图1 红外DBR激光器和光波导组合在一起所产生的具有高效波长转换的蓝光发射<br /> 早期的工作是采用光学方法用一些透镜来联接这些元件，而现在是直接把它们联接在一起形成一个组件，使之更加紧凑，<a href="http://machine.oecr.com" target="_blank" class="relatedlink">机械</a>上也更稳定。这种组件的大小只有1 cm3左右。<br /> 所制得的这种激光光源是单模的，输出波长为425 nm～429 nm，输出的光学功率<br /> 为1.5 mW，线宽低于2 MHz&#59;它的相对噪声为-140 dB/Hz,只是氮化镓蓝色半导体激光器或其他SHG蓝色激光器噪声的十分之一。运行中波长的抖动可以控制在小于0.1 nm的程度。?<br /> 这两家合作的公司提出，这种光源的应用，需要有相应的高精度光盘介质和用于蓝色激光光盘器件的光学透镜，它的应用将加速光盘器件的发展。?<br /> 可以肯定，这种激光光源除了可用作光盘的光学探头光源之外，还可用在其他方面。由于它的辐射波长短，线宽窄，它还可用作一些光学<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>仪器中的光源。</td></tr></table> </div> <div id="comment_10624" class="cm"> </div> <div id="post_rate_div_10624"></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=1833&formhash=27c3691b" 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=1833&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" 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