Frequency Comb Velocity-Modulation Spectroscopy

TL;DR

This paper introduces a novel massively parallel comb spectroscopy technique that combines cavity-enhanced frequency comb spectroscopy with velocity modulation to detect ions with high sensitivity and broad spectral coverage.

Contribution

The work presents a new method for ion-sensitive spectroscopy that achieves high sensitivity, broad spectral coverage, and rapid acquisition using a combined cavity-enhanced and velocity modulation approach.

Findings

Achieved fractional absorption sensitivity of 3 x 10^-7

Recorded over 1500 channels spanning 150 cm^-1

Spectrum acquired in 30 minutes

Abstract

We have demonstrated a new technique that provides massively parallel comb spectroscopy sensitive specifically to ions through the combination of cavity-enhanced direct frequency comb spectroscopy with velocity modulation spectroscopy. Using this novel system, we have measured electronic transitions of HfF+ and achieved a fractional absorption sensitivity of 3 x 10-7 recorded over 1500 simultaneous channels spanning 150 cm-1 around 800 nm with an absolute frequency accuracy of 30 MHz (0.001 cm-1). A fully sampled spectrum consisting of interleaved measurements is acquired in 30 minutes.