Cavity Enhanced Optical Vernier Spectroscopy, Broad Band, High Resolution, High Sensitivity

TL;DR

This paper introduces a cavity-enhanced optical Vernier spectrometer that leverages a femtosecond frequency comb and a high finesse resonator to achieve broad bandwidth, high resolution, and high sensitivity in spectroscopic measurements.

Contribution

It presents a novel spectrometer design that uses all comb modes simultaneously for rapid, high-precision absorption and dispersion spectroscopy with simplified setup.

Findings

Achieves high sensitivity through a high finesse resonator

Provides broad bandwidth and high resolution limited only by comb line width

Enables rapid, parallel spectroscopic measurements

Abstract

A femtosecond frequency comb provides a vast number of equidistantly spaced narrow band laser modes that can be simultaneously tuned and frequency calibrated with 15 digits accuracy. Our Vernier spectrometer utilizes all of theses modes in a massively parallel manner to rapidly record both absorption and dispersion spectra with a sensitivity that is provided by a high finesse broad band optical resonator and a resolution that is only limited by the frequency comb line width while keeping the required setup simple.