Pulsed and mode-locked p-Ge THz laser: wavelength-dependent properties

Tjeerd O. Klaassen; J. Niels Hovenier; W. Th. Wenckebach; Andrei V. Muravjov; Sergei G. Pavlov; Valery N. Shastin

doi:10.1117/12.361070

9 September 1999 Pulsed and mode-locked p-Ge THz laser: wavelength-dependent properties

Tjeerd O. Klaassen, J. Niels Hovenier, W. Th. Wenckebach, Andrei V. Muravjov, Sergei G. Pavlov, Valery N. Shastin

Proceedings Volume 3828, Terahertz Spectroscopy and Applications II; (1999) https://doi.org/10.1117/12.361070
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

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 The original small mirror laser outcoupler has been replaced by a mesh outcoupler, resulting in clear improvements of laser action.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.

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Tjeerd O. Klaassen, J. Niels Hovenier, W. Th. Wenckebach, Andrei V. Muravjov, Sergei G. Pavlov, and Valery N. Shastin "Pulsed and mode-locked p-Ge THz laser: wavelength-dependent properties", Proc. SPIE 3828, Terahertz Spectroscopy and Applications II, (9 September 1999); https://doi.org/10.1117/12.361070

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