Open AccessModulation of laser induced-cracks inside a LiF single crystal by fs laser irradiation at multiple points
Author(s) -
Masaaki Sakakura,
Yuki Ishiguro,
Naoaki Fukuda,
Yasuhiko Shimotsuma,
Kiyotaka Miura
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.026921
Subject(s) - laser , irradiation , materials science , optics , femtosecond , stress (linguistics) , interference (communication) , crystal (programming language) , dislocation , composite material , physics , linguistics , philosophy , channel (broadcasting) , electrical engineering , computer science , nuclear physics , programming language , engineering
Crack formations inside a LiF single crystal after femtosecond laser irradiation at multiple points were investigated. In the case of sequential laser irradiation at three points, the propagations of some cracks were prevented by the dislocation bands generated by the previous laser irradiation. On the other hand, in the case of simultaneous laser irradiation at three points with a spatial light modulator, cracks in all the <100> directions from the photoexcited regions were generated clearly, but the length of one crack depended on the distribution of laser irradiation positions. The simulation of elastic dynamics after fs laser irradiation at three points elucidated that the interference of laser induced stress waves depended on the distributions of the irradiation positions. We found that the constructive interference of stress waves at a crack tip should have prevented the crack from propagating further and the tensile stress by destructive interference of stress waves along a crack should have facilitated the propagation of the crack.