利用皮秒时间分辨显微成像技术监测非线性吸收后的冲击波和裂纹

Laser Damage Pub Date : 2023-11-24 DOI:10.1117/12.2685245
Matthew R. Ross, Jue Wang
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引用次数: 0

摘要

用强激光束照射材料后,可能会出现多种损伤形态。我们展示了激光与物质相互作用后材料的超快时间分辨显微成像。对于透明的脆性材料,这种成像可以监测多种结果过程,如冲击波、诱导应力、裂纹等。我们将介绍用于此类成像的光学系统以及已完成的几项研究的实例。通过对脉冲吸收强光产生的冲击波进行成像,可以深入了解冲击波的速度和强度。通过对裂纹随时间演变的成像,可以了解裂纹产生和增长背后的驱动力。对可见光辐射的时间分辨成像提供了辐射弛豫机制的时间尺度,对多个超快脉冲爆发期间和之后的裂纹扩展成像有助于了解脉冲爆发下裂纹增长的增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shockwave and crack monitoring following nonlinear absorption with picosecond time-resolved microscopic imaging
Many damage morphologies are possible following irradiation of materials with an intense laser beam. We present ultrafast time-resolved microscopic imaging of materials immediately following laser-matter interaction. In the case of transparent, brittle materials such imaging allows monitoring of multiple resultant processes such as shockwaves, induced stress, crack, and others. We present an optical system for such imaging and examples of several studies completed. Imaging shockwaves produced from impulsive absorption of intense light provides insight into shockwave speed and intensity. Imaging of crack evolution over time allows for understanding of the driving forces behind crack initiation and growth. Time-resolved imaging of visible emissions provides a timescale of radiative relaxation mechanisms and images the extension of cracks during and following bursts of multiple ultrafast pulses helps to understand the enhancement of crack growth under pulse bursts.
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