Linewidth broadening caused by intrinsic temperature fluctuations in quantum cascade lasers

Q. J. Wang; T. Liu

doi:10.1117/12.907178

20 January 2012 Linewidth broadening caused by intrinsic temperature fluctuations in quantum cascade lasers

Q. J. Wang, T. Liu

Proceedings Volume 8268, Quantum Sensing and Nanophotonic Devices IX; 82680M (2012) https://doi.org/10.1117/12.907178
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

The intrinsic narrow linewidth of quantum cascade lasers (QCLs) promises wide applications such as highsensitive trace-gas detection. However, so far limited work has been reported in intrinsic linewidth characteristics of QCLs. In this paper, we theoretically investigate the linewidth broadening caused by intrinsic temperature fluctuations in both mid-infrared and Terahertz QCLs. When microscopic features of the refractive index variations associated with the intersubband transitions and energy level broadening in mid-infrared QCLs are considered, the linewidth broadening increases up to a few hundred Hz in mid-IR QCLs.

Citation Download Citation

Q. J. Wang and T. Liu "Linewidth broadening caused by intrinsic temperature fluctuations in quantum cascade lasers", Proc. SPIE 8268, Quantum Sensing and Nanophotonic Devices IX, 82680M (20 January 2012); https://doi.org/10.1117/12.907178

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