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

After the photoexcitation by a femtosecond laser pulse inside a LiF single crystal, four cracks appear in the 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 in...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2014-01, Vol.114 (1), p.261-265
Main Authors: Sakakura, Masaaki, Ishiguro, Yuki, Shimotsuma, Yasuhiko, Fukuda, Naoaki, Miura, Kiyotaka
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Cracks
Femtosecond
Invited Paper
Lasers
Machines
Manufacturing
Materials science
Modulation
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Single crystals
Solvents
Stress waves
Surfaces and Interfaces
Thin Films
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Summary:After the photoexcitation by a femtosecond laser pulse inside a LiF single crystal, four cracks appear in the 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.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-013-8142-0