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Kvantovaya Elektronika, 2023, Volume 53, Number 1, Pages 29–33 (Mi qe18216)  

Interaction of laser radiation with matter. Laser plasmas

Electron diffraction study of structural changes in a thin GeTe crystal under the action of high-power femtosecond laser radiation

B. N. Mironova, I. V. Kochikovb, S. A. Aseeva, V. V. Ioninc, A. V. Kiselevc, A. A. Lotinc, S. V. Chekalina, A. A. Ischenkod, E. A. Ryabova

a Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow
b Faculty of Physics, Lomonosov Moscow State University
c Institute on Laser and Information Technologies, Branch of the Federal Research Centre ‘Crystallography and Photonics’
d MIREA — Russian Technological University, Moscow
References:
Abstract: We study the possibility of a transition of a thin crystal of germanium telluride into an amorphous form as a result of the action of high-power femtosecond laser pulses at a wavelength of 800 nm. A 20-nm-thick GeTe (GT) crystalline semiconductor film is used as a sample. Structural changes are analysed using an electron diffractometer with a source of short photoelectron pulses. The diffraction patterns are analysed and the α- and β-phases in GeTe are identified. It is found that in a strong femtosecond laser field, there occurs a sample ablation process, which is accompanied by a decrease in the thickness of the crystalline phase to 5–6 nm without significant sample amorphisation. A feature of the observed process is the absence of a light-induced transition from the crystalline to the amorphous state when a thin GT film is irradiated with femtosecond laser pulses. Possible reasons for the observed effect are discussed.
Keywords: femtosecond laser radiation, phase-changing materials, electron diffraction, thin GeTe crystal.
Funding agency Grant number
Russian Foundation for Basic Research 20-02-00146 À
Received: 17.10.2022
Revised: 20.12.2022
Accepted: 20.12.2022
English version:
Bull. Lebedev Physics Institute, 2023, Volume 50, Issue suppl. 5, Pages S552–S559
DOI: https://doi.org/10.3103/S1068335623170086
Document Type: Article
Language: Russian


Citation: B. N. Mironov, I. V. Kochikov, S. A. Aseev, V. V. Ionin, A. V. Kiselev, A. A. Lotin, S. V. Chekalin, A. A. Ischenko, E. A. Ryabov, “Electron diffraction study of structural changes in a thin GeTe crystal under the action of high-power femtosecond laser radiation”, Kvantovaya Elektronika, 53:1 (2023), 29–33 [Bull. Lebedev Physics Institute, 50:suppl. 5 (2023), S552–S559]
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