Abstract

Chirped-superlattice quantum-cascade lasers are reported that emit at $\lambda \sim 85 \mathit{\mu }\mathrm{m}$ (3.5 THz), which is to the authors’ knowledge the longest wavelength demonstrated so far with this technology. Collected peak output powers of 1.5 mW per facet were measured at liquid-helium temperature, and a maximum operating temperature of 45 K was reached. Record low-threshold-current densities of 95 and $115 \mathrm{A} {\mathrm{cm}}^{-2}$ were observed in pulsed and continuous-wave operation, respectively. For the latter, output powers of a few hundred microwatts are estimated at low temperatures.

© 2003 Optical Society of America

Temperature-insensitive long-wavelength (λ ≈14 µm) Quantum Cascade lasers with low threshold

Xue Huang, William O. Charles, and Claire Gmachl
Opt. Express 19(9) 8297-8302 (2011)

Long-wavelength (? ? 8–11.5??µm) semiconductor lasers with waveguides based on surface plasmons

Carlo Sirtori, Claire Gmachl, Federico Capasso, Jérôme Faist, Deborah L. Sivco, Albert L. Hutchinson, and Alfred Y. Cho
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High-power, continuous-wave, current-tunable, single-mode quantum-cascade distributed-feedback lasers at λ ≅ 5.2 and λ ≅ 7.95 µm

Claire Gmachl, Federico Capasso, Alessandro Tredicucci, Deborah L. Sivco, James N. Baillargeon, Albert L. Hutchinson, and Alfred Y. Cho
Opt. Lett. 25(4) 230-232 (2000)

Dual-wavelength emission from optically cascaded intersubband transitions

Carlo Sirtori, Alessandro Tredicucci, Federico Capasso, Jérôme Faist, Deborah L. Sivco, Albert L. Hutchinson, and Alfred Y. Cho
Opt. Lett. 23(6) 463-465 (1998)

Ridge-width dependence of the threshold of long wavelength (λ ≈14 µm) quantum cascade lasers with sloped and vertical sidewalls

Xue Huang, Yenting Chiu, William O. Charles, and Claire Gmachl
Opt. Express 20(3) 2539-2547 (2012)