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利用时空分辨的测量技术,测定了XeCl紫外激光烧蚀金属Cu消融粒子的发射光谱随时间与空间的强度分布。通过在不同的氢气压强下拍摄到的XeCl308nm紫外激光烧蚀金属Cu消融粒子的发光羽照片,发现激光消融粒子发光羽的颜色在不同区域有不同的颜色,不同区域的发光羽颜色随环境气压的改变而变化。随环境气压的增大,发光羽不仅逐渐变小,而且逐渐变淡。对激光消融粒子发光羽的机理进行了探讨,激光消融粒子发光羽的发光动力学模式在不同区域有不同的发光模式,且随环境气压的变化而改变。定性地解释了所观察的实验现象。

Mechanism of plasma plume produced by laser ablation of metal Cu at different ambient pressures

Spectra of metal Cu ablation by XeCl excimer laser have been measured in hydrogen atmosphere using time-space-resolved technique.The photographs of optical plume from XeCl excimer laser ablation of metal Cu particle in different hydrogen pressure have been taken.The experimental results show that plume has different colour in different range,and varies with hydrogen gas pressure.The size of plume area decreases and plume colour is getting lighter with ambient gas pressure increase.The detailed mechanism of species particle excition is discussed.The experimental results are qualitatively explained with the mechanism.