Fourier transform spectroscopy around 3 microns with a broad difference frequency comb

TL;DR

This paper presents a novel mid-infrared frequency comb generator around 3.2 microns using difference frequency generation, achieving high power per mode over a broad spectrum, and demonstrates its application in Fourier transform spectroscopy.

Contribution

The work introduces a new broadband mid-infrared frequency comb source based on difference frequency generation with high power per mode.

Findings

Achieved >10^-7 W/mode power per comb line

Spectral span exceeds 700 nm

Successfully used for direct absorption spectroscopy

Abstract

We characterize a new mid-infrared frequency comb generator based on difference frequency generation around 3.2 microns. High power per comb mode (>10-7 W/mode) is obtained over a broad spectral span (>700 nm). The source is used for direct absorption spectroscopy with a Michelson-based Fourier transform interferometer.