期刊
MICROMACHINES
卷 11, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/mi11020230
关键词
optical frequency combs; quadratic nonlinearity; second harmonic generation; optical parametric oscillator; modulation instability
类别
资金
- Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR)
- Ministero degli Affari Esteri e della Cooperazione Internazionale, project NOICE Joint Laboratory
- European Union [820419]
- Rutherford Discovery Fellowships of the Royal Society of New Zealand
- Marsden Fund of the Royal Society of New Zealand
- Ministry of Education and Science of the Russian Federation (Minobrnauka) [14.Y26.31.0017]
- Swedish Research Council [2017-05309]
- Swedish Research Council [2017-05309] Funding Source: Swedish Research Council
- Vinnova [2017-05309] Funding Source: Vinnova
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.
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