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Surface plasma influence on nanosecond laser ablation

机译：表面等离子体对纳秒激光烧蚀的影响

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The comparison of laser ablation and plasma evolution has been carried out for a molten steel sample in the absence and in the presence of surface plasma. A continuous wave (cw) laser beam was utilized for local melting of a steel (Fe 99 wt.%) sample, but it also induced a surface plasma according to optical emission spectroscopy. The cw laser was switched off for a few milliseconds to dissipate the surface plasma, but the surface temperature did not change according to optical pyrometer measurements. Molten metal was ablated by a nanosecond Nd: YAG laser pulse during cw laser operation and when it was switched off for 5 milliseconds. Comparison of laser ablation and plasma evolution in the presence and in the absence of the near-surface plasma induced by the cw laser beam has been carried out. Time-integrated plasma imaging detected slightly greater emissivity of the plasma induced during cw laser operation. The cw laser operation resulted in a twofold enhancement of the intensity of atomic lines in the spectra as well as slower decay of plasma emission. Plume temperature and electron density were slightly greater at early stages of plume expansion in surface plasma. (C) 2019 Optical Society of America
机译：在不存在和存在表面等离子体的情况下，已经对钢水样品进行了激光消融和等离子体蒸馏的比较。连续波（CW）激光束用于钢（Fe＆GT; 99重量％）样品的局部熔化，但也根据光发射光谱诱导表面等离子体。 CW激光器被关闭几毫秒以消散表面等离子体，但表面温度没有根据光学高温计测量值改变。在CW激光器操作期间纳秒Nd：YAG激光脉冲烧蚀熔融金属，并且当它被关闭5毫秒时。已经执行了CW激光束引起的存在和近表面等离子体在存在和不存在中的激光消融和等离子体演化的比较。时间集成的等离子体成像检测到CW激光操作期间诱导的等离子体的发射率略大。 CW激光操作导致频谱中原子线强度的两倍提高以及等离子体发射的较慢衰减。在表面等离子体中羽流膨胀的早期阶段，羽流温度和电子密度略大。 （c）2019年光学学会

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