【摘要】 为了降低样品表面对激光束的反射率,提高激光诱导等离子体的辐射强度,文章报道了一种在钢样品表面涂抹碳层的方法。实验结果表明,当一束高能量激光(~25 J)作用于覆盖有适当厚度碳涂层的钢样品时,激光等离子体发射的谱线强度提高了10%~28%。为解释谱线强度增强的机理,测量了等离子体的激发温度。此外,实验研究还发现,更强的原子发射光谱出现在激光等离子体径向的1 mm处,而不是在其中心位置。更多还原

【Abstract】 In order to reduce the reflectance of laser beam on sample surface and enhance the radiation intensities of laser-induced metal plasma,a means has been studied for carbon coating on the surface of steel sample.The experimental results showed that the line intensities of the laser plasma formed when a high-energy neodymium glass laser(～25 J) was used to generate the plasma in air at atmospheric pressure increased by a factor in the range of 10%-28% for the steel sample with the carbon coating.The excitation temperature of laser plasma was measured to explain the mechanism that the line intensities increase.In addition,it was found that the stronger intensity of atomic emission spectrum appeared at the radial location 1 mm in the laser plasma,not at the central place.更多还原