Applied Physics A

, Volume 60, Issue 2, pp 137–142 | Cite as

Femtosecond time-resolved reflection second-harmonic generation on polycrystalline copper

  • J. Hohlfeld
  • D. Grosenick
  • U. Conrad
  • E. Matthias
Article

Abstract

Optical Second-Harmonic Generation (SHG) in reflection from a polycrystalline copper surface in air was studied using femtosecond time-resolved pump and probe measurements at λ=625 nm. The observed time dependence of second-harmonic yield from the probe beam demonstrates, that SHG is a very sensitive technique for measuring transient electron temperatures of metals even when these are covered by an oxide layer. For polycrystalline copper, an electron-phonon energy transfer time of 2 ps was observed, corresponding to a coupling constant of 3.75×1017 W/m3 K at average lattice temperatures of about 500 K. The analysis of experimental data indicates that the time dependence of SHG is governed by the linear dielectric function ε which, in turn, is affected by the electron temperature. There is no evidence for a temperature dependence of the nonlinear susceptibility χ(2).

PACS

142.65.Ky 63.20.Kr 78.47.+p 

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • J. Hohlfeld
    • 1
  • D. Grosenick
    • 2
  • U. Conrad
    • 1
  • E. Matthias
    • 1
  1. 1.Fachbereich PhysikFreie Universität BerlinBerlinGermany
  2. 2.Max-Born-InstitutBerlinGermany

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