Author Affiliations
Abstract
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
3 State Key Laboratory of Pulsed Power Laser Technology, Hefei 230037, China
In this paper, an effective method is proposed to generate specific periodical surface structures. A 532 nm linearly polarized laser is used to irradiate the silicon with pulse duration of 10 ns and repetition frequency of 10 Hz. Laser-induced periodic surface structures (LIPSSs) are observed when the fluence is and the number of pulses is 1000. The threshold of fluence for generating LIPSS gradually increases with the decrease of the number of pulses. In addition, the laser incident angle has a notable effect on the period of LIPSS, which varies from 430 nm to 1578 nm, as the incident angle ranges from 10° to 60° correspondingly. Besides, the reflectivity is reduced significantly on silicon with LIPSS.
laser-induced periodic surface structure nanostructures fluence number of pulses incident angle Chinese Optics Letters
2022, 20(1): 013802
1 南京航空航天大学金城学院机电工程系, 江苏 南京 211156
2 南京理工大学材料科学与工程学院, 江苏 南京 210094
采用Nd∶YAG固体脉冲激光器对45钢盘表面进行了织构化处理，形成了具有不同微孔深度的织构化阵列。在织构化钢盘表面制备了Ni-MoS2复合镀层，对Al2O3陶瓷球/45钢盘进行了摩擦性能测试，并对试样表面的磨损形貌进行了分析。结果表明，不同脉冲次数对微孔最大直径的影响较小，但随着脉冲次数的增加，微孔深度和内部空腔体积显著增大。在干摩擦条件下，具有织构化阵列的复合镀层摩擦系数比未织构镀层的降低0.1~0.15，且随着微孔深度的增加，摩擦系数进一步降低，其中40个脉冲形成的织构化镀层具有最佳的抗磨减摩性能，且磨损寿命是20个脉冲形成的织构化镀层的3倍。
激光技术 表面织构化 脉冲次数 微孔深度 摩擦学性能 激光与光电子学进展
2017, 54(3): 031403
