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Proceedings Paper

Tunable cyclotron-resonance laser in germanium
Author(s): Christian Kremser; Karl Unterrainer; Erich Gornik; Gottfried Strasser; Carl R. Pidgeon
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Paper Abstract

The basic principles for achieving population inversion and stimulated emission between light hole Landau levels in p-Germanium are discussed. An inversion between the Landau levels of the light hole subband of germanium is achieved when the crystal is subject to crossed electric and magnetic fields. This leads to stimulated far-infrared emission at the cyclotron resonance frequency. The emission spectrum consists of a single line which is linearly tunable with magnetic field between 65 cm-1 and 85 cm-1. The linewidth of the observed spectrum is about 0.2 cm-1 with an estimated output power of 200 mW. Lasing is found to depend critically on the orientation of the electric and magnetic field in respect to the crystallographic axis. By a comparison of absorption and emission spectra with band structure calculations including nonparabolicity corrections, the lasing transition was identified to be the n equals 2 to n equals 1 Landau level transition of the b-set light holes. Applications of the p-Ge cyclotron resonance lasers are discussed.

Paper Details

Date Published: 1 October 1991
PDF: 11 pages
Proc. SPIE 1501, Advanced Laser Concepts and Applications, (1 October 1991); doi: 10.1117/12.46863
Show Author Affiliations
Christian Kremser, Univ. Innsbruck (Austria)
Karl Unterrainer, Univ. Innsbruck (Austria)
Erich Gornik, Technische Univ. Muenchen (Austria)
Gottfried Strasser, Technische Univ. Muenchen (Austria)
Carl R. Pidgeon, Heriot-Watt Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 1501:
Advanced Laser Concepts and Applications
Sidney Singer, Editor(s)

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