高能量激光诱导铝等离子体的发射光谱研究

用钕玻璃激光器 (～ 2 5J)烧蚀铝靶获得等离子体 ,以氩气作为保护气体 ,分析了环境气压、等离子体的观测高度、工作电压、激光功率密度对谱线强度的影响 ,并进行了简短的讨论。实验结果表明 ,环境气压为 88kPa时谱线强度最大 ;相同气压下随着观测高度的增大 ,谱线强度明显减弱 ,在气压为 88kPa观测位置距样品表面 1 5～ 2mm时谱线强度较强 ;并且随着激光工作电压、功率密度的增大 ,谱线强度逐渐提高。

Study on the Emission Spectra of Aluminum Plasma Induced by High Energy Laser

The intensities of emission spectra of laser-induced alloy aluminum plasma, with the use of a neodymium glass laser(laser pulse energy is about 25 J), were experimentally studied in argon atmosphere. The effects of atmosphere pressure, height from the observed location of the plasma to the sample surface, operating voltage, and power density of the laser on the signal intensities of emission spectra were discussed.Experimental results showed that the intensities of emission spectra are strongest under 88 kPa of gas pressure.With the increase of the height from the observed location of the plasma to the sample surface, the intensities of emission spectra decrease clearly. At the pressure of 88 kPa and the height of 1.5-2 mm, the emission spectra have maximum intensities. In addition, the spectral line intensities are enhanced significantly with the increase of operating voltage and power density.