缓冲气体压强对铜蒸气激光器输出特性的影响

Buffer Gas Pressure Effects on Copper Vapor Laser Output Characteristics

实验研究了小口径铜蒸气激光器（ＣＶＬ）输出特性与缓冲气体压强的关系。实验测出放电管有效阻抗随氖压在２．０ｋＰａ到１０．０ｋＰａ范围内升高而增加。存在最佳氖压值２．７ｋＰａ，使激光输出功率最大。随着氖压升高输出激光脉冲持续时间先降低后增加，极值处氖压为４．７ｋＰａ。输出光束截面空间强度分布在高压下边缘强中心弱的情形更为严重。

An experiment which deals with pressure effects on the output characteristics of a small radial copper vapor laser is described. When the buffer gas pressure is increased from 2.0 kPa to 10.0 kPa, the plasma tube resistance increases. At the optimal pressure about 2.7 kPa, the output power has a maximum. Moreover, following the increasing of the gas pressure, the pulse duration time first decreases and later increases, and the critical pressure is 4.7 kPa. The intensity profile of the laser output shows a lower axial intensity and a higher intensity on the tube wall at the higher pressure.