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2 March 2020 Sub-threshold linewidth broadening factor of a 3.4μm interband cascade laser operated at room temperature
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Abstract
Interband cascade laser (ICL) is a power-efficient mid-infrared semiconductor laser source. Linewidth broadening factor (LBF) is a crucial parameter of semiconductor lasers. This work investigates the sub-threshold LBF of a continuous wave ICL operated at room temperature, using the Hakki-Paoli method. The carrier-induced gain variation of the ICL is extracted from the amplified spontaneous emission spectrum. The refractive index variation is determined by the optical wavelength change, and the thermal effect is carefully removed. It shows that the LBF of the ICL around the gain peak ranges from 1.1 to 1.4, depending on the operation wavelength.
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Yu Deng and Cheng Wang "Sub-threshold linewidth broadening factor of a 3.4μm interband cascade laser operated at room temperature", Proc. SPIE 11274, Physics and Simulation of Optoelectronic Devices XXVIII, 1127422 (2 March 2020); https://doi.org/10.1117/12.2544086
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