Dual waveband signals in high power laser welding were recorded and analyzed, especially, the law between the signals magnitude and the defocusing was discussed. 记录和分析了高功率激光焊接中工作区的紫外和红外信号，着重分析了双波段信号与离焦量变化的对应规律。
There are various kinds of the self-oscillations in the preamplifier system of the high power laser facility, the origins of them were analyzed in theory. 摘要分析了高功率激光装置预放大系统内外各种自激振荡的来源，通过理论计算和实验验证提出了各种自激振荡的抑制方法，并在实践中得到验证。
