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首页> 外文会议>Conference on Photon Processing in Microelectronics and Photonics III; 20040126-20040129; San Jose,CA; US >Melting threshold and melt removal dynamics during laser interaction with steel and HgCdTe in femtosecond regime
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Melting threshold and melt removal dynamics during laser interaction with steel and HgCdTe in femtosecond regime

机译：飞秒状态下激光与钢和HgCdTe相互作用期间的熔化阈值和熔化物去除动力学

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摘要

The results of a study of a single 200 femtosecond laser pulse interaction with thick stainless steel and HgCdTe samples are reported. The threshold pulse energies required to produce surface melting are measured. The melt dynamics, material removal rate and evolution of surface morphology were observed for different pulse energies and number of laser pulses. It was observed that, similar to long laser pulse interaction, a layer of melt can be produced at the sample surface. An increase of the pulse energy results in melt ejection in the radial direction toward the periphery of the interaction zone resembling evaporation recoil melt removal typical for laser interactions in the range from nanosecond to cw. The removal of material from stainless steel samples was observed to be highly nonuniform. The columnar structures were observed on the surface of stainless steel samples. The period of these structures is dependent on laser pulse energy and the number of pulses. The observed melting threshold is compared with the theoretical prediction obtained using a two-temperature model.
机译：报告了与厚不锈钢和HgCdTe样品进行单个200飞秒激光脉冲相互作用的研究结果。测量产生表面熔化所需的阈值脉冲能量。观察了不同脉冲能量和激光脉冲数量下的熔体动力学，材料去除率和表面形态的演变。已观察到，类似于长时间的激光脉冲相互作用，可以在样品表面产生一层熔体。脉冲能量的增加导致熔体沿径向方向朝着相互作用区域的外围喷射，类似于蒸发反冲熔体去除，这对于激光相互作用通常在纳秒到cw的范围内。观察到从不锈钢样品中去除材料非常不均匀。在不锈钢样品的表面观察到柱状结构。这些结构的周期取决于激光脉冲能量和脉冲数。将观察到的熔化阈值与使用两温模型获得的理论预测值进行比较。

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