Investigation of spontaneous and coherent radiation in the 3–4 μm wavelength range in an InGaAsSb/AlGaSbAs laser heterostructure
E. A. GrebenshchikovaA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgO. G. ErshovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgB. E. ZhurtanovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgA. N. ImenkovA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgN. M. KolchanovaA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. PetersburgYu. P. YakovlevA. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg
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Coherent radiation in the 3–4 μm spectral range has been obtained for the first time in an InGaAsSb/AlGaSbAs double heterostructure grown on a GaSb substrate. It has been shown that spontaneous and coherent radiation is generated mainly as a result of interband transitions in the narrow-gap InGaAsSb layer. It has been established that the optical confinement of the electromagnetic wave is sufficient for operation of the laser up to 120 K with a square-wave supply.
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