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2 March 2020 Spectral linewidth narrowing of a quantum cascade laser by strong optical feedback
Bin-bin Zhao, Xing-Guang Wang, Cheng Wang
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Proceedings Volume 11274, Physics and Simulation of Optoelectronic Devices XXVIII; 112741J (2020) https://doi.org/10.1117/12.2544125
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
The spectral linewidth of quantum cascade lasers (QCL) is a few megahertz, while the intrinsic linewidth is only a few hundred hertz. This work proposes to employ strong optical feedback to narrow the linewidth of QCLs without any phase control. It is found that strong optical feedback always reduces the linewidth for any feedback phase. In addition, we experimentally show that the spectral linewidth of the measured QCL is reduced from 7.6 MHz down to 107 kHz by optical feedback with a feedback ratio of -3.8 dB. The corresponding frequency noise below 100 kHz Fourier frequency is reduced by about 40 dB.
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Bin-bin Zhao, Xing-Guang Wang, and Cheng Wang "Spectral linewidth narrowing of a quantum cascade laser by strong optical feedback", Proc. SPIE 11274, Physics and Simulation of Optoelectronic Devices XXVIII, 112741J (2 March 2020); https://doi.org/10.1117/12.2544125
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KEYWORDS
Quantum cascade lasers
Semiconductor lasers
Feedback control
Molecular spectroscopy
Feedback
Fluctuations and noise
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