Scientific Results

Frequency comb generation in quadratic nonlinear media

Year: 2015

Authors: Ricciardi I., Mosca S., Parisi M., Maddaloni P., Santamaria L., De Natale P., De Rosa M.

Autors Affiliation: CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, Pozzuoli (NA) Italy;
CNR-INO, Istituto Nazionale di Ottica, Largo E. Fermi 6, Arcetri Firenze, Italy

Abstract: We experimentally demonstrate and theoretically explain the onset of optical frequency combs in a simple cavity-enhanced second-harmonic-generation system, exploiting second-order nonlinear interactions. Two combs are simultaneously generated around the fundamental pump frequency, with a spectral bandwidth up to about 10 nm, and its second harmonic. We observe different regimes of generation, depending on the phase-matching condition for second-harmonic generation. Moreover, we develop an elemental model which provides a deep physical insight into the observed dynamics. Despite the different underlying physical mechanism, the proposed model is remarkably similar to the description of third-order effects in microresonators, revealing a potential variety of new effects to be explored and laying the groundwork for a novel class of highly efficient and versatile frequency comb synthesizers based on second-order nonlinear materials.


Volume: 91 (6)      Pages from: 063839  to: 063839

More Information: We wish to acknowledge fruitful discussions with J.-J. Zondy. We thank G. Notariale for technical support. M.D.R. thanks M. Cossu and her equipe for their invaluable help. This work has been partly supported by the Italian \”Ministero dell\’Istruzione, dell\’Universita e della Ricerca\” (Progetto Premiale QUANTOM – Quantum Opto-Mechanics).
KeyWords: Harmonic analysis; Nonlinear optics; Optical frequency conversion; Phase matching, Nonlinear interactions; Nonlinear materials; Optical frequency combs; Phase matching conditions; Physical mechanism; Quadratic nonlinear media; Spectral bandwidth; Third-order effects, Harmonic generation
DOI: 10.1103/PhysRevA.91.063839

Citations: 50
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