@inproceedings{14bf83b4d5384793a9ed62c694f63d9e,
title = "High-power distributed-feedback quantum cascade lasers",
abstract = "Whereas high-power operation (> 1 W of cw output power at 200 K) has been demonstrated for quantum cascade lasers emitting at λ = 4.7-6.2 μm, those devices generally exhibited multiple longitudinal modes. Recently, a distributed-feedback quantum cascade laser operating in a single spectral mode at λ = 4.8 μm and at temperatures up to 333 K has been reported. In the present work, we provide detailed measurements and modeling of its performance characteristics. The sidemode suppression ratio exceeds 25 dB, and the emission remains robustly single-mode at all currents and temperatures tested. Cw output powers of 99 mW at 298 K and 357 mW at 200 K are obtained at currents well below the thermal rollover point. The slope efficiency and subthreshold amplified spontaneous emission spectra are shown to be consistent with a coupling coefficient of no more than κL ≈ 4-5, which is substantially lower than the estimate of 9 based on the nominal grating fabrication parameters.",
keywords = "Diode laser, Mid-infrared, Quantum cascade laser, Quantum well",
author = "Bewley, {W. W.} and I. Vurgaftman and Kim, {C. S.} and Meyer, {J. R.} and J. Nguyen and Evans, {A. J.} and Yu, {J. S.} and Darvish, {S. R.} and S. Slivken",
year = "2006",
doi = "10.1117/12.640087",
language = "English (US)",
isbn = "0819461695",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Quantum Sensing and Nanophotonic Devices III",
note = "Quantum Sensing and Nanophotonic Devices III ; Conference date: 23-01-2006 Through 26-01-2006",
}