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Proceedings Paper

Femtosecond spectroscopy at the direct bandedge of germanium
Author(s): Gary Mak; Henry M. van Driel
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Paper Abstract

We time-resolve the transient, photoinduced transmission and reflectivity changes near the direct bandedge of crystalline germanium (at 295 K) with 120-fs, tunable, infrared pulses from a 76-MHz optical parametric oscillator. The data show a rich collection of phenomena including bandgap renormalization, carrier-carrier scattering, carrier cooling and (Gamma) yields L intervalley scattering. An apparent carrier density dependence in the measured intervalley scattering time is attributed to plasma screening of the Coulomb enhanced continuum absorption.

Paper Details

Date Published: 6 May 1994
PDF: 8 pages
Proc. SPIE 2142, Ultrafast Phenomena in Semiconductors, (6 May 1994); doi: 10.1117/12.175883
Show Author Affiliations
Gary Mak, Univ. of Toronto and Ontario Laser and Lightwave Research Ctr. (Canada)
Henry M. van Driel, Univ. of Toronto and Ontario Laser and Lightwave Research Ctr. (Canada)

Published in SPIE Proceedings Vol. 2142:
Ultrafast Phenomena in Semiconductors
David K. Ferry; Henry M. van Driel, Editor(s)

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