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dc.contributor.authorRodriguez, Etienneen_US
dc.contributor.authorMottaghizadeh, Alirezaen_US
dc.contributor.authorGacemi, Djamalen_US
dc.contributor.authorJeannin, Mathieuen_US
dc.contributor.authorAsghari, Zahraen_US
dc.contributor.authorVasanelli, Angelaen_US
dc.contributor.authorTodorov, Yankoen_US
dc.contributor.authorWang, Qi Jieen_US
dc.contributor.authorSirtori, Carloen_US
dc.identifier.citationRodriguez, 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-.
dc.description.abstractThe 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.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofLaser and Photonics Reviewsen_US
dc.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.en_US
dc.subjectEngineering::Electrical and electronic engineering::Optics, optoelectronics, photonicsen_US
dc.titleTunability of the free-spectral range by microwave injection into a mid-infrared quantum cascade laseren_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.organizationLaboratoire Matériaux et Phénomènes Quantiques UMR7162 Université de Paris Paris 75013, Franceen_US
dc.contributor.organizationLaboratoire de Physique de l’Ecole Normale Supérieure ENS Université PSL CNRS Sorbonne Université Université de Parisen_US
dc.contributor.researchResearch Techno Plazaen_US
dc.description.versionPublished versionen_US
dc.subject.keywordsInjection Lockingen_US
dc.subject.keywordsMid-infrared Regionen_US
dc.description.acknowledgementThis work was supported by the Singapore National Research Foundation, Competitive Research Program (NRF-CRP18-2017-02) and Singapore Ministry of Education Tier 2 Program (MOE2016-T2-2-159).en_US
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