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The slowing-down of ultrafast relaxation in C60 films at high femtosecond pump intensities

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thin film was investigated in the energy range between 1.6 eV and 3.4 eV by a pump-supercontinuum probe (PSCP) technique with a 40 fs time resolution. The relaxation rate showed pronounced spectral dependence, with a maximum at 2 eV in the region of photo-induced darkening and at 2.4 eV in the region of photo-induced bleaching. The ultrafast relaxation rate decreased with increasing pump-pulse intensity. We suggest that the observed decrease results from extraheating of the carriers in the hu and t1u bands due to internal conversion from higher excited states, which are populated by two-step photon absorption of the intense pump pulse.

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Authors and Affiliations

  1. Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow Region, 142092, Russia, , , , , , RU

    V.M. Farztdinov & Y.A. Matveets

  2. Max-Planck-Institut für biophysikalische Chemie, Postfach 2841, D-37077 Göttingen, Germany, , , , , , DE

    S.A. Kovalenko

  3. P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 117924, Russia, , , , , , RU

    N.F. Starodubtsev

  4. Laser-Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, D-37077 Göttingen, Germany, , , , , , DE

    G. Marowsky

Authors
  1. V.M. Farztdinov
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  2. S.A. Kovalenko
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  3. Y.A. Matveets
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  4. N.F. Starodubtsev
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  5. G. Marowsky
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Received: 2 May 1997/Revised version: 4 August 1997

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Farztdinov, V., Kovalenko, S., Matveets, Y. et al. The slowing-down of ultrafast relaxation in C60 films at high femtosecond pump intensities . Appl Phys B 66, 225–230 (1998). https://doi.org/10.1007/s003400050380

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  • DOI: https://doi.org/10.1007/s003400050380

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