SF_6/H_2和SF_6/C_2H_6气体激光介质脉冲放电特性及其对输出激光的影响

Pulsed Discharge Characteristics of SF_6/H_2 and SF_6/C_2H_6 Mixtures and Their Effects on Output Laser

在未采取预电离措施的情况下,研究了纯SF_6气体及SF_6/H_2和SF_6/C_2H_6两种混合气体激光介质脉冲放电特性。实验结果表明,无预电离时SF_6及其混合气体介质可以实现自引发体放电,气体介质体放电维持电压主要由SF_6含量决定,C_2H_6具有抑制电弧的作用,可以有效延长体放电维持时间。分析认为,SF_6气体高折合场强E/p导致的放电通道电流密度受限和高电负度χa_引起的放电通道中负离子分解产生二次电子,是介质实现自引发体放电的重要机理。

Stable volume discharge of gas mixture is the :foundation for discharge pumped gas laser. In this paper, the pulsed discharge characteristics of SFs, SFfi/ H2 mixture, and SFfi/C2H6 m ixturearestudied without pre-ionization. Theexperimental results show that the pulsed sel--initiation volume discharge in SFs mixture can be realized without pre-ionization,and the voltage of volume discharge depends on SF6 partial pressure. C2 H6 cansuppress the development of arc, and extend the tm e of volume discharge, and obviously improve the volume discharge of SF6 gas. The discharge mechanisms of SF6 and its mixture are discussed.