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研究了由Nd:YAG激光的一级及二级谐波(SHG)产生的不锈钢等离子体参数的测量方法。根据已知的谱线进行光谱分析,利用Boltzmann法估算出了激发温度,而等离子体的电子密度是从谱线的Stark展宽剖面估算出来的。在常压下研究了等离子体的空间及时间演化过程,结果发现谱线的积分光强及积分宽度随着时间的延迟而降低。除了逆韧致辐射吸收的估算,同时研究了激光辐照度和波长对等离子体参数的影响。
The measurement method of stainless steel plasma parameters generated by the primary and secondary harmonic (SHG) of Nd: YAG laser was studied. Spectra were analyzed using known spectral lines and the excitation temperature was estimated using the Boltzmann method, while the plasma electron density was estimated from the Stark broadening profile of the spectral lines. The evolution of plasma space and time was studied at atmospheric pressure. The results showed that the integral light intensity and integral width of the line decreased with time delay. In addition to the estimation of the inverse bremsstrahlung absorption, the effects of laser irradiance and wavelength on the plasma parameters were studied.