High-temperature performance and broad continuous tunability of terahertz quantum-cascade lasers

Sushil Kumar; Qi Qin; Chun W. I. Chan; Qing Hu; John L. Reno

doi:10.1117/12.875686

16 February 2011 High-temperature performance and broad continuous tunability of terahertz quantum-cascade lasers

Sushil Kumar, Qi Qin, Chun W. I. Chan, Qing Hu, John L. Reno

Proceedings Volume 7953, Novel In-Plane Semiconductor Lasers X; 79530O (2011) https://doi.org/10.1117/12.875686
Event: SPIE OPTO, 2011, San Francisco, California, United States

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.

Citation Download Citation

Sushil Kumar, Qi Qin, Chun W. I. Chan, Qing Hu, and John L. Reno "High-temperature performance and broad continuous tunability of terahertz quantum-cascade lasers", Proc. SPIE 7953, Novel In-Plane Semiconductor Lasers X, 79530O (16 February 2011); https://doi.org/10.1117/12.875686

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