Scientific Results

Directional quasi-phase matching AlGaAs waveguide microresonators for efficient generation of quadratic frequency combs

Year: 2017

Authors: Parisi M., Ricciardi I., Mosca S., Morais N., Hansson T., Wabnitz S., Leo G., De Rosa M.

Autors Affiliation: CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy; Laboratoire Materiaux et Phenomenes Quantiques, Universite Paris Diderot & CNRS,Sorbonne Paris Cite, 10 rue Domon et Duquet, 75205 Paris cedex 13, France; INRS-EMT, 1650 Blvd. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada; Dipartimento di Ingegneria dell’Informazione, Universit√† di Brescia, Via Branze 38, 25123 Brescia, Italy

Abstract: Optical frequency combs currently represent enabling components in a wide number of fast-growing research fields, from frequency metrology to precision spectroscopy, from synchronization of telecommunication systems to environmental and biomedical spectrometry. As recently demonstrated, quadratic nonlinear media are a promising platform for optical frequency combs generation, through the onset of an internally pumped optical parametric oscillator in cavity enhanced second-harmonic generation systems. We present here a proposal for quadratic frequency comb generation in AlGaAs waveguide resonators. Based on the crystal symmetry properties of the AlGaAs material, quasi-phase matching can be realized in curved geometries (directional quasi-phase matching), thus ensuring efficient optical frequency conversion. We propose a novel design of AlGaAs waveguide resonators with strongly reduced total losses, compatible with long-path, high-quality resonators. By means of a numerical study, we predict efficient frequency comb generation with threshold powers in the microwatt range, paving the way for the full integration of frequency comb synthesizers in photonic circuits.

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More Information: M.D.R. acknowledges support from Consiglio Nazionale delle Ricerche through the Short-Term Mobility Program 2016.
KeyWords: Aluminum alloys; Aluminum gallium arsenide; Crystal symmetry; Gallium alloys; Nanoelectronics; Natural frequencies; Nonlinear optics; Optical materials; Optical parametric oscillators; Parametric oscillators; Phase matching; Photonics; Resonators; Spectroscopy; Waveguides, AlGaAs; Frequency metrology; Micro resonators; Optical frequency combs; Precision spectroscopy; Quadratic nonlinear media; Quasi phase matching; Symmetry properties; Optical frequency conversion
DOI: 10.1117/12.2256290

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