Optical frequency combs in dispersion-controlled doubly resonant second-harmonic generation

Year: 2022

Authors: Ricciardi I.; Maddaloni P.; Natale P.D.E.; Erkintalo M.; Hansson T.; Arie A.; Wabnitz S.; de Rosa M.

Autors Affiliation: CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34 (NA), Pozzuoli, I-80078, CNR-INO, Italy; INFN, Istituto Nazionale di Fisica Nucleare, Sez. di Napoli, Complesso Universitario di M.S. Angelo, Via Cintia, Napoli, I-80126, Italy; CNR-INO, Istituto Nazionale di Ottica, largo E. Fermi 6, Firenze, I-50125, Italy; Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Auckland, Auckland, 1142, New Zealand; Department of Physics, Chemistry and Biology, Linktzping University, Linktzping, SE-581 83, Sweden; School of Electrical Engineering, Iby and Aladar Fleischman Faculty of Engineering, Tel-Aviv University, Tel-Aviv, 69978, Israel; Dipartimento di Ingegneria dell?Informazione, Elettronica e Telecomunicazioni, Sapienza Universita di Roma, Via Eudossiana 18, Roma, I-00184, Italy

Abstract: We report on the experimental realization and a systematic study of optical frequency comb generation in doubly resonant intracavity second harmonic generation (SHG). The efficiency of intracavity nonlinear processes usually benefits from the increasing number of resonating fields. Yet, achieving the simultaneous resonance of different fields may be technically complicated, all the more when a phase matching condition must be fulfilled as well. In our cavity we can separately control the resonance condition for the fundamental and its second harmonic, by simultaneously acting on an intracavity dispersive element and on a piezo-mounted cavity mirror, without affecting the quasi-phase matching condition. In addition, by finely adjusting the laser-to-cavity detuning, we are able to observe steady comb emission across the whole resonance profile, revealing the multiplicity of comb structures, and the substantial role of thermal effects on their dynamics. Lastly, we report the results of numerical simulations of comb dynamics, which include photothermal effects, finding a good agreement with the experimental observations. Our system provides a framework for exploring the richness of comb dynamics in doubly resonant SHG systems, assisting the design of chip-scale quadratic comb generators.

Journal/Review: OPTICS EXPRESS

Volume: 30 (25)      Pages from: 45694  to: 45704

KeyWords: LITHIUM-NIOBATE; PARAMETRIC OSCILLATION; MODE; SOLITON
DOI: 10.1364/OE.472424

Citations: 2
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