Impact of evolving surface nanoscale topologies infemtosecond laser structuring of Ni-based superalloy CMSX-4
Impact of evolving surface nanoscale topologies infemtosecond laser structuring of Ni-based superalloy CMSX-4
复制标题
不断发展的表面纳米级拓扑对镍基高温合金 CMSX-4 飞秒激光结构化的影响
DOI：
10.1088/2040-8978/18/1/015402
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发表时间：
2015
影响因子：
2.1
通讯作者：
Razvan Stoian
中科院分区：
文献类型：
--
作者：
Chen Li;Guanghua Cheng;Jean-Philippe Colombier;Razvan Stoian
研究了镍基高温合金CMSX-4表面纳米尺度形貌在激光辐射非均匀耦合和激光诱导周期性表面结构形成中的作用。初始表面的任意粗糙度已经能够在激光曝光时诱导低空间频率和高空间频率结构，主动确定入射场和散射场的干涉，从而导致空间能量调制。通过脉冲数量随入射剂量的拓扑变化确定规则涟漪布置中的相关演变。散射模式受到散射源几何形状的严重影响。因此，我们同样的实验研究一维纳米尺度的凹槽在确定偏振相关的结构模式，在增加照射剂量的作用。最后，通过时域有限差分模拟分析了表面纳米结构在产生沉积能量的表面调制中的作用。多脉冲中的涟漪形成是光与纳米结构之间的反馈过程的结果。
We investigate the role of surface nanoscale topographies in the inhomogeneous coupling of laser radiation to Ni-based superalloy CMSX-4 surfaces and in the formation of laser-induced periodic surface structures. The initial surface arbitrary roughness is already able, upon laser exposure, to induce low-spatial-frequency and high-spatial-frequency structures, actively determining an interference of incoming and scattered fields resulting in spatial energy modulation. A topology variation with the incoming dose via the number of pulses determines a correlated evolution in the regular ripple arrangements. The scattering pattern is severely influenced by the scattering source geometries. Therefore, we equally study experimentally the role of one-dimensional nanoscale grooves in determining polarization-dependent structuring patterns at increasing irradiation dose. Finally, the role of surface nanostructures in generating the surface modulation of deposited energy is analyzed by finite-difference-time-domain simulation. Ripple formation in multi-pulses is a result of the feedback process between light and nanostructures.