Frequency comb up- and down-conversion in a synchronously-driven ${\chi }^{(2)}$ optical microresonator

Abstract

Optical frequency combs are key to optical precision measurements. While most frequency combs operate in the near-infrared regime, many applications require combs at mid-infrared, visible or even ultra-violet wavelengths. Frequency combs can be transferred to other wavelengths via nonlinear optical processes, however, this becomes exceedingly challenging for high-repetition rate frequency combs. Here, it is demonstrated that a synchronously driven high-Q microresonator with a second-order optical nonlinearity can efficiently convert high-repetition rate near-infrared frequency combs to visible, ultra-violet and mid-infrared wavelengths providing new opportunities for microresonator and electro-optic combs in applications including molecular sensing, astronomy, and quantum optics.

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• Frequency comb generation via cascaded second-order nonlinearities in microresonators
• Beyond 100 THz-spanning ultraviolet frequency combs in a non-centrosymmetric crystalline waveguide
• Frequency combs in a microring optical parametric oscillator
• Soliton and quasi-soliton frequency combs due to second harmonic generation in microresonators
• Visible blue-to-red 10 GHz frequency comb via on-chip triple-sum frequency generation
• Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides
• Chip-Based Lithium-Niobate Frequency Combs
• Coupled-mode theory for microresonators with quadratic nonlinearity
• Mid-infrared frequency combs and staggered spectral patterns in ${\chi }^{(2)}$ microresonators
• 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
• Carrier-resolved real-field theory of multi-octave frequency combs
• Walk-off induced dissipative breathers and dissipative breather gas in microresonators