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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 new type of discharge structure designed according to the basic structure of micro-hollow cathode self-sustained discharge (MCSD) is that a plurality of MCSDs are connected in parallel to form a multi-stage discharge chain to generate a uniform glow discharge plasma with a high pressure, a large volume and a high current density, Used as a gain medium for small lasers. An air discharge experiment was carried out by using the discharge structure, a picture of the discharge plasma was recorded, and the volt-ampere characteristic curve of the discharge was measured. It was found that the structure has a positive differential resistivity throughout the discharge area. The current density, electron density and power density of the discharge plasma were estimated to be 6.4 A / cm2, 3.7 × 1015 cm-3 and 3.67 kW / cm3, respectively, at P = 26.7 kPa and at a discharge current of I = 40 mA. Experimental results show that it is feasible to fabricate small lasers by using multiple MCSDs in parallel.