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4 March 2022 Period-one oscillations of quantum cascade lasers for modulation spectroscopy applications
Bin-Bin Zhao, Yi-Bo Peng, Xing-Guang Wang, Cheng Wang
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Proceedings Volume 11995, Physics and Simulation of Optoelectronic Devices XXX; 1199504 (2022) https://doi.org/10.1117/12.2607570
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Gas sensing based on modulation spectroscopy requires sinusoidal modulation of the laser sources. This work proposes a modulation scheme for quantum cascade lasers, using the period-one (P1) oscillations. The P1 oscillations are introduced by the tilted optical feedback. Although the optical linewidth of the laser is around 15.0 MHz, the beat-note electrical linewidth of the modulation is less than 2.0 kHz, which suggests that the optical sidebands induced by the P1 oscillations are highly coherent with the main optical mode. In addition, the modulation frequency can be simply tunned by adjusting the feedback length, and the modulation depth of the optical signal is in the range of 1.0 % to 3.0 %. In contrast to the direct modulation scheme and the external modulation scheme, the proposed P1 modulation method does not require any radio-frequency electronics.
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Bin-Bin Zhao, Yi-Bo Peng, Xing-Guang Wang, and Cheng Wang "Period-one oscillations of quantum cascade lasers for modulation spectroscopy applications", Proc. SPIE 11995, Physics and Simulation of Optoelectronic Devices XXX, 1199504 (4 March 2022); https://doi.org/10.1117/12.2607570
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KEYWORDS
Modulation
Quantum cascade lasers
Spectroscopy
Laser spectroscopy
Frequency modulation
Semiconductor lasers
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