轴快流CO_2激光器预电离设计  

Design of Preionization in Fast Axial Flow CO_2 Lasers

作　　者：王红宣[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《激光与光电子学进展》2014年第12期175-178,共4页Laser & Optoelectronics Progress

基　　金：国家重点实验室基金(SKLLIM1112)

摘　　要：为了解决轴快流（FAF）CO2激光器的大体积和高气压所产生的等离子体放电不稳定问题,设计了相应的预电离装置。预电离装置安装在激光器放电管外,预电离电极由激光器放电管阳极和与其相距35 mm的铜环组成。预电离电路由多谐振荡器、RC充放电电路和可控硅构成,放电频率范围为10-20 k Hz,其目的是产生固定频率下尽可能高的初始电子密度,以降低激光器着火电压。实验结果表明：该预电离装置使激光器最大点火电压降低1.69 k V,小功率输出电压波动降低2.6 k V,能够满足轴快流CO2激光器的预电离要求,是提高激光器放电稳定性的一种有效方法。In order to solve the discharge instability problem caused by bulk mass and high gas pressure in a fast axial flow （FAF） CO2 laser, a preionization device is presented. The device is installed outside the laser discharge tube and the preionization electrode includes an anode of laser discharge tube and a 35 mm far copper collar. A multivibrator, a RC charge-discharge circuit, and an SCR are combined together to make up the preionization circuit with the discharge frequency of 10 - 20 kHz for the purpose of strengthening the initial electron density and reducing the laser firing voltage. The experimental result indicates that the preionization device decreases the laser working voltage by 1.69 kV and voltage varicance by 2.6 kV. Such a preionization device can meet the preionization requirement of an FAF CO2 laser and is an effective tool for improving laser＇s discharge stability.

关 键 词：激光器 预电离 电子密度 放电稳定性 

分 类 号：TN248.2[电子电信—物理电子学]