Modulation of transient stress distributions for controlling femtosecond laser-induced cracks inside a single crystal

Sakakura, Masaaki, Ishiguro, Yuki, Shimotsuma, Yasuhiko, Fukuda, Naoaki and Miura, Kiyotaka (2014) Modulation of transient stress distributions for controlling femtosecond laser-induced cracks inside a single crystal. Applied Physics A: Materials Science & Processing, 114 (1), 261-265. (doi:10.1007/s00339-013-8142-0).

Abstract

After the photoexcitation by a femtosecond laser pulse inside a LiF single crystal, four cracks appear in the <110> directions of the crystal from the photoexcited region. In our previous study, we found that a femtosecond laser-induced stress wave is responsible for generation and elongation of cracks inside a LiF single crystal. This finding suggests that we can control laser-induced cracks by modulating laser-induced stress waves. In this study, we applied parallel fs laser irradiation with a spatial light modulator to generate multiple stress waves at the same time, and found the modulation of crack formation; one crack became thinner and shorter than any other cracks. By a pump-probe imaging of dynamics of crack generation, we showed that the constructive interference of stress waves at a crack tip could compress the crack, which results in a thinner and shorter crack.

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