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Special Section on Quantum and Interband Cascade Lasers

High-performance quantum cascade lasers in the 7.3- to 7.8-μm wavelength band using strained active regions

[+] Author Affiliations
Richard P. Leavitt

Maxion Technologies Inc., 5000 College Park Avenue, Suite 3121, College Park, Maryland 20740

John L. Bradshaw

Maxion Technologies Inc., 5000 College Park Avenue, Suite 3121, College Park, Maryland 20740

Kevin M. Lascola

Maxion Technologies Inc., 5000 College Park Avenue, Suite 3121, College Park, Maryland 20740

Gregory P. Meissner

Maxion Technologies Inc., 5000 College Park Avenue, Suite 3121, College Park, Maryland 20740

Frankie Micalizzi

Maxion Technologies Inc., 5000 College Park Avenue, Suite 3121, College Park, Maryland 20740

Frederick J. Towner

Maxion Technologies Inc., 5000 College Park Avenue, Suite 3121, College Park, Maryland 20740

John T. Pham

Maxion Technologies Inc., 5000 College Park Avenue, Suite 3121, College Park, Maryland 20740

Opt. Eng. 49(11), 111109 (November 29, 2010). doi:10.1117/1.3498758
History: Received April 01, 2010; Revised May 24, 2010; Accepted June 01, 2010; Published November 29, 2010
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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.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Richard P. Leavitt ; John L. Bradshaw ; Kevin M. Lascola ; Gregory P. Meissner ; Frankie Micalizzi, et al.
"High-performance quantum cascade lasers in the 7.3- to 7.8-μm wavelength band using strained active regions", Opt. Eng. 49(11), 111109 (November 29, 2010). ; http://dx.doi.org/10.1117/1.3498758


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