High-temperature performance and broad continuous tunability of terahertz quantum-cascade lasers
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Hu_High-temperature performance.pdf
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3.5 MB
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Author(s)
Chan, Chun Wang Ivan
Hu, Qing
Qin, Qi
Kumar, Sushil
Reno, John L.
Date Issued
February 2011
Journal
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1117/12.875686
