Transient strain distributions during femtosecond laser-induced deformation inside LiF and MgO single crystals
Transient strain distributions during femtosecond laser-induced deformation inside LiF and MgO single crystals
Strain and stress dynamics inside MgO and LiF single crystals after photoexcitation by a focused femtosecond laser pulse were investigated by the observation of transient distributions of birefringence around the photoexcited region using a time-resolved polarization microscope. Both in MgO and LiF, propagation of two stress waves, which were attributed to quasi-longitudinal and quasi-transverse elastic waves, were observed, but crack propagation was observed only in LiF. Inside MgO, the observed strain distributions could be reproduced by elastic simulation, whereas inside LiF the strain distributions during crack propagation were largely different from the simulated ones; strain was widely distributed between cracks and the 〈110〉 regions in a stress wave, the strained region around the photoexcited region was smaller, and the strains in the 〈110〉 region and near the crack tips were larger than those by the simulation. The amplitudes of strain and stress in stress waves and temperature change in the photoexcited region were evaluated, and the origins of strain distribution change due to crack generation were discussed based on the differences between MgO and LiF.
Sakakura, Masaaki
3bb15bbd-d590-4cba-ab5a-862dc7acd054
Shimotsuma, Yasuhiko
0664279b-def2-41d4-a5ec-207ce02013a7
Fukuda, Naoaki
de44deed-c825-49ce-b6d5-5508dedb1abf
Miura, Kiyotaka
5dbc9159-ace0-4dd9-b18d-36f87ae78c47
14 July 2015
Sakakura, Masaaki
3bb15bbd-d590-4cba-ab5a-862dc7acd054
Shimotsuma, Yasuhiko
0664279b-def2-41d4-a5ec-207ce02013a7
Fukuda, Naoaki
de44deed-c825-49ce-b6d5-5508dedb1abf
Miura, Kiyotaka
5dbc9159-ace0-4dd9-b18d-36f87ae78c47
Sakakura, Masaaki, Shimotsuma, Yasuhiko, Fukuda, Naoaki and Miura, Kiyotaka
(2015)
Transient strain distributions during femtosecond laser-induced deformation inside LiF and MgO single crystals.
Journal of Applied Physics, 118 (2), [023106].
(doi:10.1063/1.4926614).
Abstract
Strain and stress dynamics inside MgO and LiF single crystals after photoexcitation by a focused femtosecond laser pulse were investigated by the observation of transient distributions of birefringence around the photoexcited region using a time-resolved polarization microscope. Both in MgO and LiF, propagation of two stress waves, which were attributed to quasi-longitudinal and quasi-transverse elastic waves, were observed, but crack propagation was observed only in LiF. Inside MgO, the observed strain distributions could be reproduced by elastic simulation, whereas inside LiF the strain distributions during crack propagation were largely different from the simulated ones; strain was widely distributed between cracks and the 〈110〉 regions in a stress wave, the strained region around the photoexcited region was smaller, and the strains in the 〈110〉 region and near the crack tips were larger than those by the simulation. The amplitudes of strain and stress in stress waves and temperature change in the photoexcited region were evaluated, and the origins of strain distribution change due to crack generation were discussed based on the differences between MgO and LiF.
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Accepted/In Press date: 30 June 2015
Published date: 14 July 2015
Additional Information:
No Southampton authors at time of publication
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Local EPrints ID: 431171
URI: http://eprints.soton.ac.uk/id/eprint/431171
ISSN: 0021-8979
PURE UUID: b8b8aba5-b37d-4ec7-a8b3-c1327bcbc2e4
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Date deposited: 24 May 2019 16:30
Last modified: 16 Mar 2024 01:56
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Author:
Masaaki Sakakura
Author:
Yasuhiko Shimotsuma
Author:
Naoaki Fukuda
Author:
Kiyotaka Miura
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