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Observation of stress wave and thermal stress in ultrashort pulse laser bulk processing inside glass

Observation of stress wave and thermal stress in ultrashort pulse laser bulk processing inside glass
Observation of stress wave and thermal stress in ultrashort pulse laser bulk processing inside glass
Stress dynamics, stress wave and thermal stress, after photoexcitation inside glass a by tightly focused ultrashort laser pulse were investigated by a pump-probe polarization microscope and Transient Lens (TrL) method. The observation by the pump-probe polarization microscope revealed transient birefringence distributions of a laser-induced stress wave and thermal stress. The directions of compressive stress by a stress wave and thermal stress were radial from the photoexcitation, and the amplitudes of the stress estimated from the retardance of the birefringence were as high as several hundreds MPa. The observation by the TrL measurement showed the propagation of a laser induced stress wave as an oscillating TrL signals. From the pulse duration dependence of the oscillation amplitudes of the TrL signals, we found that the threshold and sensitivity to pulse energy of the stress wave become higher at longer pulse duration. We interpreted the pulse duration dependence in terms of different ionization mechanism; multiphoton ionization should be dominant for shorter pulse durations, while avalanche ionization should be dominant for longer pulse duration.
femtosecond laser processing, pump-probe, dynamics, glass, stress wave, ionization process
1880-0688
159-164
Sakakura, Masaaki
3bb15bbd-d590-4cba-ab5a-862dc7acd054
Shimotsuma, Yasuhiko
0664279b-def2-41d4-a5ec-207ce02013a7
Miura, Kiyotaka
5dbc9159-ace0-4dd9-b18d-36f87ae78c47
Sakakura, Masaaki
3bb15bbd-d590-4cba-ab5a-862dc7acd054
Shimotsuma, Yasuhiko
0664279b-def2-41d4-a5ec-207ce02013a7
Miura, Kiyotaka
5dbc9159-ace0-4dd9-b18d-36f87ae78c47

Sakakura, Masaaki, Shimotsuma, Yasuhiko and Miura, Kiyotaka (2017) Observation of stress wave and thermal stress in ultrashort pulse laser bulk processing inside glass. Journal of Laser Micro/Nanoengineering, 12 (2), 159-164. (doi:10.2961/jlmn.2017.02.0019).

Record type: Article

Abstract

Stress dynamics, stress wave and thermal stress, after photoexcitation inside glass a by tightly focused ultrashort laser pulse were investigated by a pump-probe polarization microscope and Transient Lens (TrL) method. The observation by the pump-probe polarization microscope revealed transient birefringence distributions of a laser-induced stress wave and thermal stress. The directions of compressive stress by a stress wave and thermal stress were radial from the photoexcitation, and the amplitudes of the stress estimated from the retardance of the birefringence were as high as several hundreds MPa. The observation by the TrL measurement showed the propagation of a laser induced stress wave as an oscillating TrL signals. From the pulse duration dependence of the oscillation amplitudes of the TrL signals, we found that the threshold and sensitivity to pulse energy of the stress wave become higher at longer pulse duration. We interpreted the pulse duration dependence in terms of different ionization mechanism; multiphoton ionization should be dominant for shorter pulse durations, while avalanche ionization should be dominant for longer pulse duration.

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More information

Published date: September 2017
Additional Information: No Southampton authors at time of publication
Keywords: femtosecond laser processing, pump-probe, dynamics, glass, stress wave, ionization process

Identifiers

Local EPrints ID: 431148
URI: http://eprints.soton.ac.uk/id/eprint/431148
ISSN: 1880-0688
PURE UUID: 6b449d22-2623-4a78-bf88-963ff2094c7f

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Date deposited: 24 May 2019 16:30
Last modified: 16 Mar 2024 01:56

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Contributors

Author: Masaaki Sakakura
Author: Yasuhiko Shimotsuma
Author: Kiyotaka Miura

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