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28 February 2006 High-power distributed-feedback quantum cascade lasers
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. W. Bewley, I. Vurgaftman, C. S. Kim, J. R. Meyer, J. Nguyen, A. J. Evans, J. S. Yu, S. R. Darvish, S. Slivken, and M. Razeghi "High-power distributed-feedback quantum cascade lasers", Proc. SPIE 6127, Quantum Sensing and Nanophotonic Devices III, 612704 (28 February 2006);

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