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中文摘要：
为了研究预制小孔对激光诱导不锈钢等离子体辐射特性的影响，在常压下空气中，利用高能量钕玻璃脉冲激光烧蚀不锈钢样品，由组合式多功能光栅光谱仪和CCD光谱采集处理系统记录等离子体光谱，并通过测量光谱线的强度和半高全宽度分别计算了等离子体电子温度和电子密度。研究结果表明，当一束高能量激光（～5J）作用于表面放置直径为1．5mm、深度为0.8mm的预制小孔的不锈钢样品时，激光等离子体发射的谱线强度提高了71．5％～125．8％，光谱信背比提高了7．6％～18．5％；而等离子体温度和电子密度分别提高了1200K和1．21×10^16cm^-3证明了预制小孔对激光诱导不锈钢等离子体辐射有明显的增强作用。
英文摘要：
The prefabricated keyhole effects on the radiation characteristic of laser-induced stainless steel plasma were investigated. A high-energy neodymium glass pulse laser was used to ablate stainless steel sample in air at atmospheric pressure. Combined-type multi-function grating spectroscope and CCD spectral acquainting and processing system were used to record plasma spectrum. The electron temperature and the full width at half maximum of spectral line, respectively. The study results showed that the spectral intensity and signal-to-background ratio of laser plasma increase in the range of 71.5% ~ 125.8 % and 7.6%18. 5% respectively when a laser beam （~5 J） acted on the stainless steel sample on which prefabricated keyholes （d= 1.5 mm, h=0.8 mm） were placed. The plasma temperature and electron density increased by about 1 200 K and 1.21 ×10^16cm^-3, respectively. This proved that prefabricated keyhole had a significant enhancement effect on the radiation of laser-induced stainless steel plasma.
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