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Applied Physics A

, Volume 101, Issue 1, pp 1–5 | Cite as

Acoustic probing of two-temperature relaxation initiated by action of ultrashort laser pulse

  • N. A. Inogamov
  • S. I. Ashitkov
  • V. V. Zhakhovsky
  • V. V. Shepelev
  • V. A. Khokhlov
  • P. S. Komarov
  • M. B. Agranat
  • S. I. Anisimov
  • V. E. Fortov
Article

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 T∼100 nm in Al. The d T-layer and the free rear side of the film are coupled through pressure waves propagating between them. Therefore, the processes within d T-layer affects the time dependent displacement Δ x rear(t) of the rear surface. We compare simulated and experimental dependencies Δ x rear(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.

Keywords

Rabie Ultrashort Laser Pulse Amplitude Part Heated Layer Entropy Mode 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • N. A. Inogamov
    • 1
  • S. I. Ashitkov
    • 2
  • V. V. Zhakhovsky
    • 2
    • 3
  • V. V. Shepelev
    • 4
  • V. A. Khokhlov
    • 1
  • P. S. Komarov
    • 2
  • M. B. Agranat
    • 2
  • S. I. Anisimov
    • 1
  • V. E. Fortov
    • 2
  1. 1.Institute for Theoretical PhysicsRussian Academy of SciencesChernogolovkaRussia
  2. 2.Joint Institute of High TemperatureRussian Academy of SciencesMoscowRussia
  3. 3.Department of PhysicsUniversity of South FloridaTampaUSA
  4. 4.Institute for Computer Aided DesignRussian Academy of SciencesMoscowRussia

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