神光-Ⅲ原型装置预放钕玻璃高增益自激振荡的分析与抑制  

Analysis and Control of Self-Excitation Oscillation in TIL of the SG-Ⅲ Facility

作　　者：卢振华[1] 郝欣[1] 唐军[1] 邓青华[1] 罗亦鸣[1] 高松[1] 丁磊[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《激光与光电子学进展》2011年第9期93-96,共4页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(10735050);中国工程物理研究院激光聚变研究中心和等离子体物理国家级重点实验室创新基金(20090604)资助课题

摘　　要：在高功率激光装置的预放系统中,高增益放大单元提供超过106的增益倍数,极易形成自激振荡,降低光束放大倍数、破坏光学元件。基于高功率固体激光系统自激起振的主要判据,通过分析钕玻璃高增益系统损耗与增益的大小,研究了神光-Ⅲ原型装置高增益放大单元的自激振荡问题。分析了系统可能存在的自激振荡腔,指出系统可能存在3个起振的振荡腔。通过采取钕玻璃端面引入倾角、适当的光路调节、加隔离和电光开关等方法,在一定程度上抑制了自激振荡,进行了相应的实验验证,实验结果表明通过上述措施基本消除了自激光问题。In the pre-amplifier of high power laser facilities, more than 106 gain is produced by the high gain amplifier, in which self-excitation oscillation would be easily formed. Based on the theory of self-excitation oscillation, the gain and loss in the system are analyzed, and the self-excitation problems in the high gain amplifiers of TIL of the SG-Ⅲ facility are studied. There self-excitation cavities would possibly exist in the system. Using the methods including tilting the ends of Nd： glasses, adjusting the beam, utilizing isolations and electro-optical switches, the self-excitation oscillation is controlled. These suppression methods are validated in experiments.

关 键 词：激光技术 自激振荡 高增益放大 高功率固体激光装置 

分 类 号：TN248[电子电信—物理电子学]