Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Dual-comb spectroscopy



Ian R. Coddington, Nathan R. Newbury, William C. Swann


Dual-comb spectroscopy is an emerging new spectroscopic tool that exploits the frequency resolution, frequency accuracy, broad bandwidth, and brightness of frequency combs for ultra-high resolution, sensitive broadband spectroscopy. By use of two coherent frequency combs, dual-comb spectroscopy allows a sample’s spectral response to be read out on a comb tooth-by-tooth basis rapidly and without the size constraints of a conventional spectrometer. This review describes dual-comb spectroscopy and summarizes the current state-of-the-art. As frequency comb technology progresses, dual-comb spectroscopy will continue to mature and could surpasses conventional broadband spectroscopy for a wide range of laboratory and non-laboratory applications.


Frequency comb, dual-comb, spectroscopy


Coddington, I. , Newbury, N. and Swann, W. (2016), Dual-comb spectroscopy, Optica (Accessed November 30, 2023)
Created April 13, 2016, Updated October 21, 2020