Femtosecond spectroscopy at the direct bandedge of germanium

Gary Mak; Henry M. van Driel

doi:10.1117/12.175883

6 May 1994 Femtosecond spectroscopy at the direct bandedge of germanium

Gary Mak, Henry M. van Driel

Proceedings Volume 2142, Ultrafast Phenomena in Semiconductors; (1994) https://doi.org/10.1117/12.175883
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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.

Citation Download Citation

Gary Mak and Henry M. van Driel "Femtosecond spectroscopy at the direct bandedge of germanium", Proc. SPIE 2142, Ultrafast Phenomena in Semiconductors, (6 May 1994); https://doi.org/10.1117/12.175883

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