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

TL;DR

This paper demonstrates efficient frequency conversion in a high-Q microresonator with second-order nonlinearity, enabling transfer of near-infrared combs to visible, UV, and mid-IR wavelengths for advanced optical applications.

Contribution

It introduces a novel method for high-repetition rate frequency comb conversion using a synchronously driven $ ext{chi}^{(2)}$ microresonator, expanding wavelength accessibility.

Findings

Efficient conversion of near-infrared combs to visible, UV, and mid-IR wavelengths.

Potential applications in molecular sensing, astronomy, and quantum optics.

Enhanced control over frequency comb spectral regions.

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.