平面反射镜装置对激光诱导等离子体辐射特性的影响

为获得高质量的发射光谱，提出了一种平面反射镜装置，研究了在平面反射镜装置条件下的激光诱导等离子体辐射特性。实验结果表明，相同的激光输出能量条件下，在等离子体周围放置由三块平面反射镜组成的装置以后，土壤样品中元素Mg，Fe，Ba，Ti和Al的光谱线强度比常态下的分别增大了116.2%，96.43%，90.93%，102.1%和98.57%，信噪比分别提高39.17%，32.48%，38.07%，39.95%和21.30%。通过测量激光等离子体参数，解释了平面反射镜装置对等离子体辐射增强的机理。这种简便易行的方法是改善激光诱导击穿光谱技术检测能力的有效途径。

Effect of Flat-Mirror Device on Laser-Induced Plasma Radiation Characteristics

To improve the quality of laser-induced breakdown spectroscopy, flat-mirror device was proposed. The effects of flat-mirror device on the radiation characteristics of laser-induced plasma were studied. The experimental results showed that when the device consisted of three flat-mirrors placed around the plasma, the spectral line intensity of Mg, Fe, Ba, Ti and Al increases by about 116.2%, 96.43%, 90.93%, 102.1% and 98.57% than that without flat-mirror device, and the signal-to-noise raises by around 39.17%, 32.48%, 38.07%, 39.95% and 21.30%，respectively. By measuring the plasma parameters，the mechanism of the radiation enhancement obtained with the device consisting of three flat-mirrors was explained. This method was an effective way to improve the detection capacity of LIBS.