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- Title
Acoustic probing of two-temperature relaxation initiated by action of ultrashort laser pulse.
- Authors
Inogamov, N. A.; Ashitkov, S. I.; Zhakhovsky, V. V.; Shepelev, V. V.; Khokhlov, V. A.; Komarov, P. S.; Agranat, M. B.; Anisimov, S. I.; Fortov, V. E.
- Abstract
Ultrashort laser pulse transfers metal into a two-temperature warm dense matter state and triggers a chain of hydrodynamic and kinetic processes-melting, expansion, stretching, creation of tensile stress and transition into metastable state. We study the response of aluminum film deposited on a glass substrate to irradiation by a pump laser pulse transmitted through glass. Several films with thicknesses from 350 to 1200 nm have been investigated. The smallest thickness is of the order of the heating depth d∼100 nm in Al. The d-layer and the free rear side of the film are coupled through pressure waves propagating between them. Therefore, the processes within d-layer affects the time dependent displacement Δ x( t) of the rear surface. We compare simulated and experimental dependencies Δ x( t) obtained by the pump-probe technique. It allows us to define a thickness of molten Al layer and explore the two-temperature processes occurring inside the heated layer.
- Subjects
ULTRASHORT laser pulses; HYDRODYNAMICS; TEMPERATURE; DYNAMICS; ALUMINUM films
- Publication
Applied Physics A: Materials Science & Processing, 2010, Vol 101, Issue 1, p1
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-010-5765-2