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Proceedings Paper

High-temperature performance and broad continuous tunability of terahertz quantum-cascade lasers
Author(s): Sushil Kumar; Qi Qin; Chun W. I. Chan; Qing Hu; John L. Reno
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Paper Abstract

We demonstrate a terahertz quantum-cascade laser (QCL) operating significantly above the temperature of hv/kB, which had so-far been been an empirical limitation for the maximum operating temperature of these devices. With a design that employs a new scattering-assisted injection scheme, a 1.8 THz QCL operating up to a temperature of 1.9hv/kB (163 K) is realized with more than 3 mW of peak optical power output at 150 K. We also demonstrate continuous tunability over a frequency range of 137 GHz of a single-mode QCL operating at 3.8 THz in metal-metal waveguides. A unique concept of altering the lateral mode profile of the "wire laser" waveguide geometry was implemented to achieve tuning despite the strong mode confinement of metal-metal waveguides at terahertz frequencies.

Paper Details

Date Published: 16 February 2011
PDF: 7 pages
Proc. SPIE 7953, Novel In-Plane Semiconductor Lasers X, 79530O (16 February 2011); doi: 10.1117/12.875686
Show Author Affiliations
Sushil Kumar, Lehigh Univ. (United States)
Qi Qin, Massachusetts Institute of Technology (United States)
Chun W. I. Chan, 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. 7953:
Novel In-Plane Semiconductor Lasers X
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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