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Proceedings Paper

Spectral linewidth narrowing of a quantum cascade laser by strong optical feedback
Author(s): Bin-bin Zhao; Xing-Guang Wang; Cheng Wang
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Paper 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.

Paper Details

Date Published: 2 March 2020
PDF: 6 pages
Proc. SPIE 11274, Physics and Simulation of Optoelectronic Devices XXVIII, 112741J (2 March 2020); doi: 10.1117/12.2544125
Show Author Affiliations
Bin-bin Zhao, ShanghaiTech Univ. (China)
Shanghai Institute of Microsystem and Information Technology (China)
Univ. of Chinese Academy of Sciences (China)
Xing-Guang Wang, ShanghaiTech Univ. (China)
Shanghai Institute of Microsystem and Information Technology (China)
Univ. of Chinese Academy of Sciences (China)
Cheng Wang, ShanghaiTech Univ. (China)


Published in SPIE Proceedings Vol. 11274:
Physics and Simulation of Optoelectronic Devices XXVIII
Bernd Witzigmann; Marek Osiński; Yasuhiko Arakawa, Editor(s)

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