Frequency comb UV spectroscopy with one million resolved comb lines

TL;DR

This paper demonstrates high-resolution UV dual-comb spectroscopy resolving up to one million lines, advancing spectral measurement capabilities in the ultraviolet range.

Contribution

It introduces a dual-comb spectroscopy technique in the UV with unprecedented line resolution, resolving up to one million comb lines simultaneously.

Findings

Resolved approximately 1,000,000 comb lines in UV spectrum

Achieved spectral resolution with 80 MHz line spacing

Performed spectroscopy in two UV bands simultaneously

Abstract

We perform dual-comb spectroscopy in two UV bands: 325-342 nm and 372-410 nm, corresponding to the 7th and 6th harmonics of a dual-comb 2.35-{\mu}m laser source, and simultaneously resolve ~500,000 and ~1,000,000 comb lines spaced by 80 MHz respectively.