Frequency comb generation in quadratic nonlinear media

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.

25 pages, 7 figures

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• Towards optical frequency comb generation in continuous-wave pumped titanium indiffused lithium niobate waveguide resonators
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• Coupled-mode theory for microresonators with quadratic nonlinearity
• Walk-off controlled self-starting frequency combs in ${\chi }^{(2)}$ optical microresonators
• Enhancement of the second-harmonic generation based on the cascaded second- and third-order nonlinear processes in a multimode optical microcavity
• Localized structures formed through domain wall locking in cavity-enhanced second-harmonic generation
• Theory of ${\chi }^{(2)}$-microresonator-based frequency conversion
• Super-Resonant Intracavity Coherent Absorption
• A high-power waveguide resonator second harmonic device with external conversion efficiency up to 75%
• Spectral characterization of a frequency comb based on cascaded quadratic nonlinearities inside an optical parametric oscillator
• Frequency-domain model of optical frequency-comb generation in optical resonators with second- and third-order nonlinearities
• Two-color flat-top solitons in microresonator-based optical parametric oscillators
• Two-color flat-top solitonic pulses in ${\chi }^{(2)}$ optical microresonators via second harmonic generation
• Bistable soliton optical frequency combs in a second harmonic generation Kerr cavity
• Fine structure of second-harmonic resonances in χ^{(2)} optical microresonators