Actively mode-locked THz p-Ge hot-hole lasers with electric pulse-separation control and gain control

Remco C. Strijbos; Andrei V. Muravjov; S. H. Withers; Sergei G. Pavlov; Valery N. Shastin; Robert E. Peale

doi:10.1117/12.347123

29 April 1999 Actively mode-locked THz p-Ge hot-hole lasers with electric pulse-separation control and gain control

Remco C. Strijbos, Andrei V. Muravjov, S. H. Withers, Sergei G. Pavlov, Valery N. Shastin, Robert E. Peale

Proceedings Volume 3617, Terahertz Spectroscopy and Applications; (1999) https://doi.org/10.1117/12.347123
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

Electric control of the separation between two interleaved pulse trains from a far-IR p-Ge laser, which is actively mode-locked by rf gain modulation at the second harmonic of the roundtrip frequency, is demonstrated by changing the electric bias at the rf contacts. A suggested application is telemetry using pulse-separation modulation. Optimal operation of the laser on the light-to-heavy-hole transition requires strong, perfectly crossed electric and magnetic fields, but the experimental data reveal a electric-field component along the magnetic field caused by space-charge effects inside the laser crystal, even when the applied fields are perfectly orthogonal. Monte Carlo simulations together with a Poisson solver are used to discuss the various mechanisms behind these effects and to find the electric field inside the laser crystal. These calculations agree reasonably well with experimental data obtained so far, and show not only the significant impact that charging can have on the output of actively mode-locked p-Ge lasers, but also suggest that they strongly influence the average gain of p-Ge lasers in general.

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Remco C. Strijbos, Andrei V. Muravjov, S. H. Withers, Sergei G. Pavlov, Valery N. Shastin, and Robert E. Peale "Actively mode-locked THz p-Ge hot-hole lasers with electric pulse-separation control and gain control", Proc. SPIE 3617, Terahertz Spectroscopy and Applications, (29 April 1999); https://doi.org/10.1117/12.347123

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KEYWORDS

Mode locking

Magnetism

Modulation

Electroluminescence

Laser crystals

Phonons

Crystals

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