摘要
在实际使用中,喇曼激光器工作4年至5年,其红外激光输出功率会明显下降(下降幅度可达到50%～70%)。本文在理论上阐述了工作气体甲烷的漏气现象以及气体光分解反应是激光输出功率下降的主要原因。实验表明,随着甲烷气压的增高,喇曼频移中高阶斯托克斯光将会增强,从而抑制一阶斯托克斯光,同时甲烷气体在实验中产生光分解反应并在喇曼窗口产生沉淀污染,这些均极大地降低了输出激光的效率。针对以上问题,考虑提高喇曼盒的制作工艺以提高其密封性能,减少漏气现象,同时加入缓冲气体(如H_2,He,Ar)以在一定程度上抑制甲烷的光分解反应。
In the pratical use, the output power of an infrared Raman laser will be decreased obviously （up to 50% - 70%） after it is used for four or five years. In this paper, it is declared theoretically that the leakage and photolysis reaction of the methane gas used are the the main reasons why the laser output power is decreased. The experiment shows that with the increase of the pressure of the methane gas, the high order Stokes light will be enhanced and the first order Stokes light will be inhibited in the Raman shift. At the same time, the photolysis reaction of the methane gas can result in the precipitation at the Raman window. To solve these problems, it is necessary to improve the sealing performance of the Raman laser and add buffer gas （e.g. H2, He, Ar） in the laser so as to inhibit the photolysis reaction of the methane gas to a certain extent.
出处
《红外》
CAS
2009年第7期22-26,共5页
Infrared
