Scheme for single-shot frequency comb absorption sensing on chip

TL;DR

This paper proposes a photonic chip-compatible scheme for single-shot frequency comb absorption sensing, enabling flexible, alignment-free, and full reconstruction of asymmetric absorption profiles with high sensitivity.

Contribution

The authors introduce a novel on-chip compatible method that allows independent sampling of comb teeth and full absorption profile reconstruction without precise alignment.

Findings

Enables independent sampling of each comb tooth.

Allows tailoring of the comb span for specific measurements.

Reconstructs asymmetric absorption profiles without extra components.

Abstract

Frequency comb absorption spectroscopy combined with low-noise, fast homodyne measurements provide a toolbox for ultra-sensitive absorption measurements. Integrating these schemes on photonic platforms to bring them closer to practical applications is challenging. Here, we propose a scheme that can be readily adapted on a photonic platform. We show that each frequency comb tooth can independently sampled, the span of the comb can be tailored, and that our method does not require a careful alignment of the comb centre with any absorption profiles. This allows an asymmetric absorption profile to be reconstructed in full without requiring additional components.