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Proceedings Paper

Investigation of the pumping mechanism of the p-GE cyclotron resonance laser
Author(s): C. Kremser
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Paper Abstract

An Inversion between Landau levels (LL's) of the light hole (lh) subband of germanium is achieved when the crystal is subjected to crossed electric and magnetic fields /1,2/. This leads to stimulated far infrared (FIR) emission at the cyclotron resonance (CR) frequency. The emission spectrum consists of a single line linearly tunable with magnetic field /3/. Lasing was found to depend critically on the orientation of the electric and magnetic field with respect to the crystallographic axes. Characteristically the laser emission is observed in two field regimes - which we call here low field (1) and high field (2) - depending on conditions of sample doping and external stress. In general, low concentration samples (NA − ND = 8 × 1012 cm-3) oscillate in region (1) giving frequencies between 30 cm-1 and 50 cm-1, and high concentration samples (NA − ND = 6 × 1013 cm-3) oscillate in region (2) with frequencies between 65 cm-1 and 85 cm-1. The latter samples howerver can be made to oscillate also in range (1) by applying uniaxial stress /4/.

Paper Details

Date Published: 1 October 1991
PDF: 2 pages
Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15762F (1 October 1991); doi: 10.1117/12.2297800
Show Author Affiliations
C. Kremser, Univ. Innsbruck (Austria)

Published in SPIE Proceedings Vol. 1576:
16th International Conference on Infrared and Millimeter Waves
Minh Quang Tran, Editor(s)

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