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Optical Frequency Combs in Quadratically Nonlinear Resonators

CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, I-80078 Pozzuoli (NA), Italy
INFN, Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, 80126 Napoli, Italy
OPERA-photonics, Université libre de Bruxelles, 50 Avenue F. D. Roosevelt, CP 194/5, B-1050 Bruxelles, Belgium
Department of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden
The Dodd-Walls Centre for Photonic and Quantum Technologies, Auckland 1142, New Zealand
Physics Department, The University of Auckland, Auckland 1142, New Zealand
CNR-INO, Istituto Nazionale di Ottica, Largo E. Fermi 6, I-50125 Firenze, Italy
Dipartimento di Ingegneria dell’Informazione, Elettronica e Telecomunicazioni, Sapienza Università di Roma- Via Eudossiana 18, I-00184 Roma, Italy
Department of Physics, Novosibirsk State University, 1 Pirogova Street, Novosibirsk 630090, Russia
Author to whom correspondence should be addressed.
Micromachines 2020, 11(2), 230;
Received: 17 January 2020 / Revised: 17 February 2020 / Accepted: 19 February 2020 / Published: 24 February 2020
(This article belongs to the Special Issue Nonlinear Photonics Devices)
Optical frequency combs are one of the most remarkable inventions in recent decades. Originally conceived as the spectral counterpart of the train of short pulses emitted by mode-locked lasers, frequency combs have also been subsequently generated in continuously pumped microresonators, through third-order parametric processes. Quite recently, direct generation of optical frequency combs has been demonstrated in continuous-wave laser-pumped optical resonators with a second-order nonlinear medium inside. Here, we present a concise introduction to such quadratic combs and the physical mechanism that underlies their formation. We mainly review our recent experimental and theoretical work on formation and dynamics of quadratic frequency combs. We experimentally demonstrated comb generation in two configurations: a cavity for second harmonic generation, where combs are generated both around the pump frequency and its second harmonic and a degenerate optical parametric oscillator, where combs are generated around the pump frequency and its subharmonic. The experiments have been supported by a thorough theoretical analysis, aimed at modelling the dynamics of quadratic combs, both in frequency and time domains, providing useful insights into the physics of this new class of optical frequency comb synthesizers. Quadratic combs establish a new class of efficient frequency comb synthesizers, with unique features, which could enable straightforward access to new spectral regions and stimulate novel applications. View Full-Text
Keywords: optical frequency combs; quadratic nonlinearity; second harmonic generation; optical parametric oscillator; modulation instability optical frequency combs; quadratic nonlinearity; second harmonic generation; optical parametric oscillator; modulation instability
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MDPI and ACS Style

Ricciardi, I.; Mosca, S.; Parisi, M.; Leo, F.; Hansson, T.; Erkintalo, M.; Maddaloni, P.; De Natale, P.; Wabnitz, S.; De Rosa, M. Optical Frequency Combs in Quadratically Nonlinear Resonators. Micromachines 2020, 11, 230.

AMA Style

Ricciardi I, Mosca S, Parisi M, Leo F, Hansson T, Erkintalo M, Maddaloni P, De Natale P, Wabnitz S, De Rosa M. Optical Frequency Combs in Quadratically Nonlinear Resonators. Micromachines. 2020; 11(2):230.

Chicago/Turabian Style

Ricciardi, Iolanda, Simona Mosca, Maria Parisi, François Leo, Tobias Hansson, Miro Erkintalo, Pasquale Maddaloni, Paolo De Natale, Stefan Wabnitz, and Maurizio De Rosa. 2020. "Optical Frequency Combs in Quadratically Nonlinear Resonators" Micromachines 11, no. 2: 230.

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