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23 February 2007 High-performamce continuous wave quantum cascade lasers with widely spaced operation frequencies
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Abstract
Room temperature, continuous wave (CW) operation of distributed feedback (DFB) quantum cascade lasers with widely spaced operation frequencies is reported. The relatively small temperature tuning range of a single device, smaller or equal to approximately 1 % of the wavelength, usually limits their efficiency for spectroscopic investigations. By using a bound-to-continuum active region to create a broad gain spectrum and monolithic integration of different DFB gratings, we achieved high-performance devices with single-mode emission between 7.7 and 8.3 &mgr;m at a temperature of +30 °C. This frequency span corresponds to 8 % of the center frequency. The maximum CW operation temperature achieved was 63 °C at the gain center and as much as 35 °C and 45 °C, respectively, at the limits of the explored wavelength range.
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A. Wittmann, L. Hvozdara, S. Blaser, M. Giovannini, J. Faist, D. Hofstetter, M. Beck, and E. Gini "High-performamce continuous wave quantum cascade lasers with widely spaced operation frequencies", Proc. SPIE 6485, Novel In-Plane Semiconductor Lasers VI, 64850P (23 February 2007); doi: 10.1117/12.713734; https://doi.org/10.1117/12.713734
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