4 February 2013 Continuous-wave room-temperature operation of λ ~ 3 μm quantum cascade laser
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Quantum Cascade Lasers (QCLs), operating in continuous wave (cw) at room temperature (rt) in 3-3.5μm spectral range, which overlaps the spectral fingerprint region of many hydrocarbons, is essential in spectroscopic trace gas detection, environment monitoring, and pollution control. A 3μm QCL, operating in cw at rt is demonstrated. This initial result makes it possible, for the most popular material system (AlInAs/GaInAs on InP) used in QCLs in mid-infrared and long-infrared, to cover the entire spectral range of mid-infrared atmospheric window (3-5μm). In0.79Ga0.21As/In0.11Al0.89As strain balanced superlattice, which has a large conduction band offset, was grown. The strain was balanced with composite barriers (In0.11Al0.89As /In0.4Al0.6As) in the injector region, to eliminate the need of extremely high compressively strained GaInAs, whose pseudomorphic growth is very difficult.
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N. Bandyopadhyay, N. Bandyopadhyay, Y. Bai, Y. Bai, S. Tsao, S. Tsao, S. Nida, S. Nida, S. Slivken, S. Slivken, M. Razeghi, M. Razeghi, "Continuous-wave room-temperature operation of λ ~ 3 μm quantum cascade laser", Proc. SPIE 8631, Quantum Sensing and Nanophotonic Devices X, 86310M (4 February 2013); doi: 10.1117/12.2019105; https://doi.org/10.1117/12.2019105

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