横流CWCO_2激光器电子密度的研究

Study of electron density in a high power CW transverse-flow CO_2 laser

用Langmuir静电探针测量5kW横流CO_2激光器放电等离子体,根据P.R.Smy流动等离子体厚鞘理论进行分析,表明在工作气压力为42Torr、放电电流为10～20A的情况下,电子密度约为(1.7～3.1)x10^(11)cm^(-3)的范围内,并沿流向成非均匀分布,其极大值出现在距阳极板上游边沿3cm处.电子的连续性方程给实验结果以解释,理论与实验较好地符合.

Measurements of the electron density in a 5 kW CW transverse-flow CO2 laser gag discharge are presented. Experiments were performed with a single Langmulr probe. Electron density was evaluated using P. E. Smys' thick shealth expression for a flowing plasma. The spatial distribution of electron density and an analysis using the electron continue equation are given. In the condition of pressure 42 Torr, discharge current 20 A, the electron density is about 3×1011cm-3 and along the flow, the distribution was unhomogeneous, the maximum value occured at 3 cm from The top edge of the anode in the floe direction. The explaination of the experimental results is given by the continuity formulation of oleotrons, the theory ooinoides with the experiment.