Mid-infrared frequency combs and staggered spectral patterns in ${\chi }^{(2)}$ microresonators

Abstract

The potential of frequency comb spectroscopy has aroused great interest in generating mid-infrared frequency combs in the integrated photonic setting. However, despite remarkable progress in microresonators and quantum cascade lasers, the availability of suitable mid-IR comb sources remains scarce. Here, we present a new approach for the generation of mid-IR microcombs through cascaded three-wave-mixing. By pumping a CdSiP${}_2$ microresonator at 1.55 $\mu$m wavelength with a low power continuous wave laser, we generate ${\chi }^{(2)}$ frequency combs at 3.1 $\mu$m wavelength, with a span of about 30 nm. We observe ordinary combs states with a line spacing of the free spectral range of the resonator, and combs where the sideband numbers around the pump and half-harmonic alternate, forming staggered patterns of spectral lines. Our scheme for mid-IR microcomb generation is compatible with integrated telecom lasers. Therefore, it has the potential to be used as a simple and fully integrated mid-IR comb source, relying on only one single material.

References in corpus (9)

• Frequency comb spectroscopy
• Silicon-Chip Mid-Infrared Frequency Comb Generation
• On-chip mid-infrared and THz frequency combs for spectroscopy
• Optical frequency combs in quadratically nonlinear resonators
• Coupled-mode theory for microresonators with quadratic nonlinearity
• Bright-soliton frequency combs and dressed states in chi(2) microresonators
• Sech-squared Pockels solitons in the microresonator parametric down-conversion
• Ladder of Eckhaus instabilities and parametric conversion in chi(2) microresonators
• Parametric conversion via second harmonic generation and two-hump solitons in phase-matched microresonators

Cited by in corpus (2)

• Soliton Microcomb Generation in a III-V Photonic Crystal Cavity
• Walk-off induced dissipative breathers and dissipative breather gas in microresonators