Free-electron laser studies of direct and indirect two-photon absorption in germanium

Free-electron laser studies of direct and indirect two-photon absorption in germanium

The two-photon absorption of germanium was observed for both the direct and the indirect gaps, using the Vanderbilt free-electron laser. The two-photon absorption for the indirect gap was found to be three orders of magnitude smaller than the direct gap. The indirect-gap threshold position indicates...

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Veröffentlicht in:Physical review letters 1993-06, Vol.70 (26), p.4146-4149
Hauptverfasser: TUNCEL, E, STAEHLI, J. L, COLUZZA, C, MARGARITONDO, G, MCKINLEY, J. T, ALBRIDGE, R. G, BARNES, A. V, UEDA, A, YANG, X, TOLK, N. H
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Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Infrared and raman spectra and scattering
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
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container_end_page 4149
container_issue 26
container_start_page 4146
container_title Physical review letters
container_volume 70
creator TUNCEL, E
STAEHLI, J. L
COLUZZA, C
MARGARITONDO, G
MCKINLEY, J. T
ALBRIDGE, R. G
BARNES, A. V
UEDA, A
YANG, X
TOLK, N. H
description The two-photon absorption of germanium was observed for both the direct and the indirect gaps, using the Vanderbilt free-electron laser. The two-photon absorption for the indirect gap was found to be three orders of magnitude smaller than the direct gap. The indirect-gap threshold position indicates that the two-photon absorption is assisted by an LO phonon, providing a long-delayed positive test of the Bassani--Hassan predictions.
doi_str_mv 10.1103/physrevlett.70.4146
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source American Physical Society Journals
subjects Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Infrared and raman spectra and scattering
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Physics
title Free-electron laser studies of direct and indirect two-photon absorption in germanium
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