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Proceedings Paper

Pulsed and mode-locked p-Ge THz laser: wavelength-dependent properties
Author(s): Tjeerd O. Klaassen; J. Niels Hovenier; W. Th. Wenckebach; Andrei V. Muravjov; Sergei G. Pavlov; Valery N. Shastin
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Paper Abstract

Wavelength dependent properties of the p-Ge THz laser are reported for pulsed as well as for mode locked operation. The original small mirror laser outcoupler has been replaced by a mesh outcoupler, resulting in clear improvements of laser action. The optical output has been analyzed using a grating spectrometer and fast Schottky diode detectors. FOr 0.25 <EQ B <EQ 0.6T, 170-185 micrometers emission occurs. Laser action starts at short wavelength; during the pulse, longer wavelength components gain intensity, until simultaneous emission across the whole band occurs. With the mesh outcoupler instead of a small mirror, the small signal gain is found to increase, for instance from 0.015 cm-1 to 0.04 cm-1 at 172 micrometers . With the rf field modulation applied, 770 MHz mode locking of the laser is achieved at 172 micrometers , yielding a train of 100 ps FWHM pulses. For 0.5 <EQ B <EQ 1.4T, 75-120 micrometers emission is observed, dependent on both B and E field. Time-and wavelength dependence is complicated; often an oscillatory behavior of spectral components is seen. Although this effect complicates the formation of stable pulse trains under mode locked conditions, 140 ps pulses have been produced.

Paper Details

Date Published: 9 September 1999
PDF: 10 pages
Proc. SPIE 3828, Terahertz Spectroscopy and Applications II, (9 September 1999); doi: 10.1117/12.361070
Show Author Affiliations
Tjeerd O. Klaassen, Delft Univ. of Technology (Netherlands)
J. Niels Hovenier, Delft Univ. of Technology (Netherlands)
W. Th. Wenckebach, Delft Univ. of Technology (Netherlands)
Andrei V. Muravjov, Institute for Physics of Microstructures (Russia)
Sergei G. Pavlov, Institute for Physics of Microstructures (Russia)
Valery N. Shastin, Institute for Physics of Microstructures (Russia)

Published in SPIE Proceedings Vol. 3828:
Terahertz Spectroscopy and Applications II
J. Martyn Chamberlain, Editor(s)

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