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Coherent phonon dynamics in a c-plane sapphire crystal before and after intense femtosecond laser irradiation

Coherent phonon dynamics in a c-plane sapphire crystal before and after intense femtosecond laser irradiation
Coherent phonon dynamics in a c-plane sapphire crystal before and after intense femtosecond laser irradiation
Femtosecond pump-probe experiments with a ∼6.4 fs time-resolution were performed to investigate the coherent phonon dynamics in a c-plane sapphire crystal before and after intense 800 nm femtosecond laser irradiation. The intense femtosecond laser induced defect/distortion and even re-crystallization of crystalline structures, which result in the appearance of new peaks and relative intensity change in coherent phonon and Raman spectra. The combination of these two spectra was found to be beneficial to evidence the variation of crystalline structure and further to differentiate the origins of new Raman peaks after irradiation. Further analysis of time-dependent differential absorbance with damped cosine function fitting and Fourier transfer calculation yields the vibrational parameters, including periods, damping times and initial phases, before and after irradiation. With these parameters, the defect-effects on damping time and the mechanism of coherent phonon generation were addressed.
1094-4087
16003-16011
Zhao, Xin
e0a3c282-1e8c-4a88-9986-e396ef5c433c
Nie, Zhaogang
7a466e90-4931-4f37-8a54-a083badffce3
Ma, Lin
28467018-254e-4939-89b3-d63467c5eec5
Zhang, Fangteng
180017f9-679c-485e-914d-9d74c5d055ed
Hao, Mingming
1bd0d2ed-e857-47f6-a3b2-37c13e620fe1
Wang, Bo
d61a16a4-fb0a-450b-a00e-114136c6c1f2
Zhao, Weiren
83f6cf0a-38eb-470c-9c21-0409d1bed974
Luo, Li
77028676-d147-497e-b26e-3ab29f2c453c
Zhang, Jiahua
baf10f58-4ca3-48b9-b648-bd67f1bc638b
Huang, Chung-Che
825f7447-6d02-48f6-b95a-fa33da71f106
Zhao, Xin
e0a3c282-1e8c-4a88-9986-e396ef5c433c
Nie, Zhaogang
7a466e90-4931-4f37-8a54-a083badffce3
Ma, Lin
28467018-254e-4939-89b3-d63467c5eec5
Zhang, Fangteng
180017f9-679c-485e-914d-9d74c5d055ed
Hao, Mingming
1bd0d2ed-e857-47f6-a3b2-37c13e620fe1
Wang, Bo
d61a16a4-fb0a-450b-a00e-114136c6c1f2
Zhao, Weiren
83f6cf0a-38eb-470c-9c21-0409d1bed974
Luo, Li
77028676-d147-497e-b26e-3ab29f2c453c
Zhang, Jiahua
baf10f58-4ca3-48b9-b648-bd67f1bc638b
Huang, Chung-Che
825f7447-6d02-48f6-b95a-fa33da71f106

Zhao, Xin, Nie, Zhaogang, Ma, Lin, Zhang, Fangteng, Hao, Mingming, Wang, Bo, Zhao, Weiren, Luo, Li, Zhang, Jiahua and Huang, Chung-Che (2020) Coherent phonon dynamics in a c-plane sapphire crystal before and after intense femtosecond laser irradiation. Optics Express, 28 (11), 16003-16011. (doi:10.1364/OE.392505).

Record type: Article

Abstract

Femtosecond pump-probe experiments with a ∼6.4 fs time-resolution were performed to investigate the coherent phonon dynamics in a c-plane sapphire crystal before and after intense 800 nm femtosecond laser irradiation. The intense femtosecond laser induced defect/distortion and even re-crystallization of crystalline structures, which result in the appearance of new peaks and relative intensity change in coherent phonon and Raman spectra. The combination of these two spectra was found to be beneficial to evidence the variation of crystalline structure and further to differentiate the origins of new Raman peaks after irradiation. Further analysis of time-dependent differential absorbance with damped cosine function fitting and Fourier transfer calculation yields the vibrational parameters, including periods, damping times and initial phases, before and after irradiation. With these parameters, the defect-effects on damping time and the mechanism of coherent phonon generation were addressed.

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More information

Accepted/In Press date: 6 May 2020
e-pub ahead of print date: 13 May 2020
Published date: 25 May 2020

Identifiers

Local EPrints ID: 441018
URI: http://eprints.soton.ac.uk/id/eprint/441018
ISSN: 1094-4087
PURE UUID: 810b54af-5666-4f1b-814a-4714b85bc086
ORCID for Chung-Che Huang: ORCID iD orcid.org/0000-0003-3471-2463

Catalogue record

Date deposited: 27 May 2020 16:55
Last modified: 09 Jun 2020 00:29

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Contributors

Author: Xin Zhao
Author: Zhaogang Nie
Author: Lin Ma
Author: Fangteng Zhang
Author: Mingming Hao
Author: Bo Wang
Author: Weiren Zhao
Author: Li Luo
Author: Jiahua Zhang
Author: Chung-Che Huang ORCID iD

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