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Proceedings Paper

High-temperature and high-power terahertz quantum-cascade lasers
Author(s): Benjamin S. Williams; Qi Qin; Sushil Kumar; Qing Hu; John L Reno
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Paper Abstract

We summarize recent results in the development of terahertz quantum cascade lasers (QCLs) based on resonant-phonon active region designs. First, we describe attempts to improve high-temperature operation of terahertz QCLs by the use of double-phonon depopulation in order to prevent thermal backfilling of the lower radiative state. While the best of the three tested devices displayed a threshold current density of Jth=170 A/cm2 at 5 K and lased up to 138 K in pulsed mode, no temperature advantage was observed compared to single-phonon designs. Also, we describe high power operation of two different THz QCLs that emit up to 248 mW (pulsed) and 135 mW (continuous-wave) at 4.3-4.5 THz, and 75 mW (pulsed) at 4.8-5.0 THz.

Paper Details

Date Published: 8 February 2007
PDF: 10 pages
Proc. SPIE 6485, Novel In-Plane Semiconductor Lasers VI, 64850M (8 February 2007); doi: 10.1117/12.714207
Show Author Affiliations
Benjamin S. Williams, Univ. of California, Los Angeles (United States)
Qi Qin, Massachusetts Institute of Technology (United States)
Sushil Kumar, Massachusetts Institute of Technology (United States)
Qing Hu, Massachusetts Institute of Technology (United States)
John L Reno, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 6485:
Novel In-Plane Semiconductor Lasers VI
Carmen Mermelstein; David P. Bour, Editor(s)

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