TEA CO2激光器不同放电电路放电过程的比较
Comparison of discharge between different circuits of TEA CO2 laser
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摘要: 利用像增强CCD相机对脉冲CO2激光器的放电区进行观测，获得了放电辉光的发展过程，由此研究了长脉冲放电电路和短脉冲放电电路对放电过程的影响。发现普通电容放电电路（长脉冲放电电路）存在与自持放电阶段相对应的二次辉光；采用磁压缩开关的短脉冲放电电路，预电离出现较晚，但预电离辉光峰值和主放电辉光峰值之间间距较短，不存在自持放电阶段，只观测到一次强辉光。长脉冲放电电路与短脉冲放电电路在放电的后期均存在一个阴极位降区形成的过程。短脉冲放电电路有利于产生更窄的脉宽和更高的峰值功率。
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关键词:
- TEA CO2激光器 /
- 脉冲放电 /
- 电容放电开关 /
- 磁压缩开关 /
- 阴极位降区
Abstract: Time-resolved photos of the discharge of TEA(transversely excited atmospheric pressure) CO2 laser taken by ICCD camera were analyzed. Quantitative data on the spatial distribution and the temporal development of the discharge were given. Second glow originated from the selfsustained discharge was found in the case of usual capacitor discharge circuit (long pulse discharge circuit). The light emission of the preionization with a short pulse discharge circuit using a magnetic compress switch formed later, but the interval between preionization and main discharge was shorter. For both long pulse discharge circuit and short pulse discharge circuit, the formation of cathode sheath occurred in the late stage of discharge. Short pulse discharge circuit has advantages to obtain shorter pulse dur -
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