工作参数对激光诱导玻璃等离子体特性的影响

Effects of parameters on spectrum characteristics of laser-induced glass plasma

采用波长532 nm的Nd:YAG纳秒激光器激发诱导空气中的玻璃,由高分辨率的光谱仪和ICCD对等离子体发射光谱采集和实现光电转换.以Si I 288.20 nm、Ca II 393.37 nm两条谱线作为分析线,研究ICCD门延迟,ICCD门宽、聚焦透镜到样品表面的距离(LTSD)对等离子体信号强度和信噪比的影响,确定最优化的实验参数:ICCD门宽1400 ns,ICCD门延迟500 ns,LTSD为84.5 mm.在最优化的实验条件下以Ca元素的六条离子谱线(315.89 nm,317.93 nm,370.60 nm,373.69 nm,393.37 nm,396.85 nm)为分析线,计算得到玻璃等离子体的电子温度和电子密度分别20060 K,8.256×10^16 cm^-3.

The glass in the air is excited by a Nd:YAG nanosecond laser with wavelength 532 nm.The collection and photoelectric conversion of the plasma emission spectrum are realized by a high-resolution spectrometer and an ICCD.SiI(288.20 nm)and CaII(393.37 nm)were used as analysis lines to study the effect of ICCD gate delay,ICCD gate width,distance from focus lens to sample surface(LTSD)on plasma signal intensity and signal-to-noise ratio.The optimized experimental parameters are determined:the ICCD gate is 1400 ns wide,the ICCD gate is delayed by 500 ns,and the LTSD is 84.5 mm.Under the optimized experimental conditions,the electron temperature and electron density of glass plasma are calculated by using six ion spectral lines of CaⅡ(315.89 nm,317.93 nm,370.60 nm,373.69 nm,393.37 nm,396.85 nm)as analytical lines.The electron temperature and electron density of glass plasma are calculated at 20060 K and 8.256×10^16 cm^-3,respectively.