liangliang
发表于 2004-5-11 04:06:00
泵浦源用LD，是说半导体吗？
小鲁
发表于 2004-5-11 22:18:00
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BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent"><DIV><P 0cm 0cm 0pt; TEXT-ALIGN: center" align=center>纤芯<p></p></P></DIV></TD></TR></TABLE></v:textbox></v:shape><v:shape><v:textbox style="mso-next-textbox: #_x0000_s1056" inset="0,0,0,0"><TABLE cellSpacing=0 cellPadding=0 width="100%"><TR><TD #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent"><DIV><P 0cm 0cm 0pt">多模泵浦<p></p></P></DIV></TD></TR></TABLE></v:textbox></v:shape></v:group><p></p></P><P>目前开发研制的光纤激光器主要采用掺稀土元素的光纤作为增益介质。由于光纤激光器中光纤纤芯很细，在泵浦光的作用下光纤内极易形成高功率密度，造成激光工作物质的激光能级“粒子数反转”。因此，当适当加入正反馈回路（构成谐振腔）便可形成激光振荡。</P><P>包层泵浦光纤激光器</P><P>包层泵浦的技术基础是利用具有两个同心纤芯的特种掺杂光纤。一个纤芯和传统的单模光纤纤芯相似，专用于传输信号光，并实现对信号光的单模放大。而大的纤芯则用于传输不同模式的多模泵浦光。这样，使用多个多模激光二极管同时耦合至包层光纤上，当泵浦光每次横穿过单模光纤纤芯时，就会将纤芯中稀土元素的原子泵浦到上能级，然后通过跃迁产生自发辐射光，通过在光纤内设置的光纤光栅的选频作用，特定波长的自发辐射光可被振荡放大而最后产生激光输出。目前，该技术被称为多模并行包层泵浦技术。</P><P>拉曼光纤激光器：线形腔拉曼光纤激光器;环行腔拉曼光纤激光器.采用布拉格光栅作为其谐振腔的反射镜</P><P></FONT> </P>
小鲁
发表于 2004-5-11 22:20:00
不好意思,想贴图没有贴上
johnnychen
发表于 2004-5-18 00:46:00
<P>谢谢大大</P><P>请问那边有得看?</P>