小型激光器新颖放电结构的研究

New discharge configuration for mini-laser

根据微空心阴极自持放电(MCSD)基本结构设计的一种新型放电结构是把多个MCSD并联在一起构成多级放电链,产生高气压、大体积、高电流密度的均匀辉光放电等离子体,用来作为小型激光器的增益介质。利用该放电结构进行了空气放电实验,记录了放电等离子体图片,测量了放电的伏安特性曲线,发现该结构在整个放电区域都具有正的微分电阻系数。在气压P=26.7 kPa,放电电流I=40 mA时,估算放电等离子体中电流密度、电子密度和功率密度分别为6.4 A/cm2,3.7×1015 cm-3,4.67 kW/cm3。实验结果表明利用多个MCSD并联构成多级放电链制作小型激光器是可行的。

A novel discharge device was designed on the base of the configuration of micro-hollow cathode sustained discharge （MCSD）, and it was a multi-level discharge chain by many MCSD in parallel operation for forming high-pressure, large-volume, high-current density uniformity glow discharge plasmas, which could be used as the gain-media of mini-laser. The discharge experirnent had been carded with the air in different pressure and the high-pressure stable direct-current glow discharge was formed in the devices. The end-on photograph of the discharge plasmas was taken. The dc voltage-current characteristics of the discharge showed a positive slope, and it had positive differential resistance coefficient at entire current area. The current density, electron density and power density were estimated to 6.4 A/cm^2, 3.7×10^15 cm^-3, 4.67 kW/cm^3 in the discharge plasmas at P=26.7 kPa and I=40 mA. The result indicates that it is feasible for the discharge device fabricating for mini-laser.