Optical Frequency Combs Generated by Four-Wave Mixing in Optical Fibers for Astrophysical Spectrometer Calibration and Metrology

TL;DR

This paper proposes using four-wave mixing in optical fibers to generate optical frequency combs for precise spectrometer calibration and metrology, offering tunable spacing and high accuracy.

Contribution

It introduces a novel method of generating frequency combs via four-wave mixing in fibers, enabling wide tunability without resonators.

Findings

Negligible phase mismatch due to fiber properties

Wide tunability of comb spacing from GHz to THz

Potential for high-precision astrophysical calibration

Abstract

Optical frequency combs generated by multiple four-wave mixing of two stabilized single-frequency lasers in optical fibers are proposed for use as high precision frequency markers, calibration of astrophysical spectrometers and metrology. Use of highly nonlinear and photonic crystal fibers with very short lengths and small group velocity dispersion, combined with energy and momentum conservation required by the parametric generation, assures negligible phase mismatch between comb frequencies. In contrast to combs from mode-locked lasers or microcavities, the absence of a resonator allows large tuning of the frequency spacing from tens of gigahertz to beyond teraHertz.