1 November 2010 High-performance quantum cascade lasers in the 7.3- to 7.8-µm wavelength band using strained active regions
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We consider the use of strained quantum cascade (QC) laser designs in the 7.3- to 7.8-µm wavelength region to improve the cw operating characteristics of these lasers at room temperature. We compare the performance of a QC laser with a strain-balanced active region with that of two similarly designed QC lasers with lattice-matched active-region layers, and we show that the strain-balanced design significantly outperforms the unstrained-layer designs in terms of threshold-current density, power slope efficiency, and cw output power at room temperature. A epi-side-down-mounted, double-channel ridge-geometry laser that was fabricated from the strained design with a ridge width of 13 µm and a cavity length of 3 mm produced cw output power in excess of 500 mW at room temperature. The characteristic temperature T0 for the strained-layer design as determined from pulsed measurements between 25 and 80°C is 221.5 K, compared with a value of 194.0 K for one of the unstrained designs.
© (2010) Society of Photo-Optical Instrumentation Engineers (SPIE)
Richard P. Leavitt, Richard P. Leavitt, John L. Bradshaw, John L. Bradshaw, Kevin M. Lascola, Kevin M. Lascola, Gregory P. Meissner, Gregory P. Meissner, Frankie Micalizzi, Frankie Micalizzi, Fredrick J. Towner, Fredrick J. Towner, John T. Pham, John T. Pham, } "High-performance quantum cascade lasers in the 7.3- to 7.8-µm wavelength band using strained active regions," Optical Engineering 49(11), 111109 (1 November 2010). https://doi.org/10.1117/1.3498758 . Submission:

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