报道了一种在铝样品表面涂抹碳层以降低样品表面对激光束的反射率,提高激光诱导等离子体辐射强度的方法.结果表明,当一束高能量激光(～10 J)作用于覆盖有16μm的有两次涂抹碳层的铝样品时,激光等离子体发射的谱线强度提高了8%～29%.通过测量铝元素一组谱线强度,用斜率法求得等离子体的激发温度.铝样品表面涂抹合适厚度的碳层时,由于激光等离子体半径增大,激发温度和辐射强度均有提高,证明激光烧蚀能量与样品的热耦合效率提高.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.
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