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29 December 2004 Quantum cascade laser progress and outlook
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Recent progress and outlook in quantum cascade lasers (QCLs) in the mid- to far-infrared wavelength range (3.6-16 μm) are reviewed. Our recent work has focused on the development of high-power continuous-wave (CW) QCLs emitting in wavelengths of 4.3-6.3 μm at room temperature and above. For λ~6 μm, advanced heterostructure geometries, including the use of a thick electroplated gold, epilayer-side heat sink lead to the first remarkable high-power CW QCL performance above room temperature, and a buried-ridge heterostructure are demonstrated to improve significantly laser performance (i.e., 579 mW at 298 K and operation up to 343 K) when combined with narrow laser ridges. Through re-engineering the optimized strain-balanced design, a similar excellent operation is achieved at 4.3-6.3μm. The pulse operations of the shorter wavelength (3.6-4 μm) and the long wavelength (8-16 μm) QCLs at room temperature are also demonstrated. Lastly, these results are put in the perspective of other reported results and possible future directions are discussed.
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Manijeh Razeghi, Jae Su Yu, Allan J. Evans, Steven Slivken, Shaban Ramezani Darvish, John Edward David, Jean Nguyen, Burc Gokden, and Shahriar Khosravani "Quantum cascade laser progress and outlook", Proc. SPIE 5617, Optically Based Biological and Chemical Sensing for Defence, (29 December 2004);

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