Optical two-photon absorption in GaAs measured by optical-pump terahertz-probe spectroscopy

F. Kadlec, H. Němec, and P. Kužel
Phys. Rev. B 70, 125205 – Published 14 September 2004

Abstract

Time-resolved terahertz experiments in a novel setup were used for a direct observation of the competition between the single- and two-photon absorption in highly excited GaAs. The experiments were carried out near 800nm where the single photon absorption usually dominates. The crystal surface was excited by femtosecond laser pulses with fluences up to 4.2mJcm2, for which the single-photon absorption saturates and the two-photon absorption becomes the leading absorption mechanism. The two-photon absorption coefficient β, its anisotropy and the depth profile of the photoexcited carriers were determined.

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  • Received 11 February 2004

DOI:https://doi.org/10.1103/PhysRevB.70.125205

©2004 American Physical Society

Authors & Affiliations

F. Kadlec*, H. Němec, and P. Kužel

  • Institute of Physics, Academy of Sciences of the Czech Republic, and Center for Molecular Systems and Biomolecules, Na Slovance 2, 182 21 Prague 8, Czech Republic

  • *Electronic address: kadlecf@fzu.cz

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Vol. 70, Iss. 12 — 15 September 2004

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