High-temperature performance and broad continuous tunability of terahertz quantum-cascade lasers
Author(s)
Chan, Chun Wang Ivan; Hu, Qing; Qin, Qi; Kumar, Sushil; Reno, John L.
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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.
Date issued
2011-02Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer ScienceJournal
Proceedings of SPIE--the International Society for Optical Engineering, 2011
Publisher
SPIE
Citation
Kumar, Sushil et al. “High-temperature Performance and Broad Continuous Tunability of Terahertz Quantum-cascade Lasers.” 2011. 79530O–79530O–7. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).
Version: Final published version
ISSN
0277-786X