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Title: Tunability of the free-spectral range by microwave injection into a mid-infrared quantum cascade laser
Authors: Rodriguez, Etienne
Mottaghizadeh, Alireza
Gacemi, Djamal
Jeannin, Mathieu
Asghari, Zahra
Vasanelli, Angela
Todorov, Yanko
Wang, Qi Jie
Sirtori, Carlo
Keywords: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Issue Date: 2020
Source: Rodriguez, E., Mottaghizadeh, A., Gacemi, D., Jeannin, M., Asghari, Z., Vasanelli, A., Todorov, Y., Wang, Q. J. & Sirtori, C. (2020). Tunability of the free-spectral range by microwave injection into a mid-infrared quantum cascade laser. Laser and Photonics Reviews, 14(5), 1900389-.
Project: NRF-CRP18-2017-02
Journal: Laser and Photonics Reviews
Abstract: The free-spectral range (FSR) of quantum cascade lasers (QCLs) emitting at 4.7 µm can be tuned through direct microwave modulation. The intrinsic short carrier lifetime of inter-subband transitions, along with impedance matched electrical packaging, allows a high-speed modulation up to more than 30 GHz. A significant broadening and flattening of the lasing spectrum is observed under radio frequency (RF) injection with frequencies close to the round-trip cavity. An accurate analysis of the high resolution spectra of the laser shows a comb-like regime for both free-running and RF modulated QCLs, if the modulation frequency is within the locking-range of the device. One of the main advantages of collecting high-resolution mid-infrared spectra, over the plain investigation of the beatnote in the microwave region, is the access to all the longitudinal modes and thus the accurate measure of the FSR over the whole optical spectrum. The use of high-resolution spectroscopy provides an in-depth and comprehensive analysis of lasing spectra under microwave modulations.
ISSN: 1863-8899
DOI: 10.1002/lpor.201900389
Rights: © 2020 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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