Work

Laser modulation simulation of micro-crack morphology evolution during chemical etching

Year: 2019

Type: conference-paper

Abstract: Subsurface micro-cracks will be generated during the grinding and polishing processes of optical components. Microcracks have a modulation effect on the laser, thereby reducing the laser damage threshold. The FDTD method is used to simulate the light intensity distribution modulated by micro-crack. By comparing the simulation results of radial crack, parabolic crack and elliptic crack, the modulation mechanism of micro-crack is revealed. The results show that for the crack with the same width and depth, light intensity enhancement factor (LIEF) modulated by radial crack on the rear surface and parabolic crack on the front surface is the largest; LIEF modulated by elliptical crack on the rear surface and radial crack on the front surface is the smallest. In addition, when the crack width-depth ratio is the same, the larger the depth, the higher the LIEF. As the width-depth ratio increases, the LIEF value increases firstly, then decreases, and finally approaches a stable value.

Source: Pacific Rim Laser Damage: Optical Materials for High-Power Lasers (PLD)

DOI: 10.1117/12.2540729

Authors: Zhi Chen, Huapan Xiao, Zhibin Li, Na Yu, Hairong Wang, Rongguang Liang

Institutions: Xi'an Jiaotong University, University of Arizona

Language: English

Topic: Laser Material Processing Techniques

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: bronze

Funders: National Natural Science Foundation of China, International Joint Laboratory for MicroNano Manufacturing and Measurement Technologies

Awards: G3254076192, G5467732122, G6378690266, G7586546504