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Related Experiment Video

Updated: Jul 17, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

Broadband cavity ringdown spectroscopy for sensitive and rapid molecular detection.

Michael J Thorpe¹, Kevin D Moll, R Jason Jones

¹JILA, National Institute of Standards and Technology (NIST) and University of Colorado, and Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA.

Science (New York, N.Y.)

|March 18, 2006

Summary

This study showcases efficient cavity ringdown spectroscopy using an optical frequency comb for sensitive molecular measurements. The technique enables real-time analysis of trace gases, transition strengths, and population dynamics across a wide spectral range.

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Area of Science:

Spectroscopy
Quantum Optics
Molecular Physics

Background:

Cavity ringdown spectroscopy (CRDS) is a sensitive technique for measuring absorption.
Optical frequency combs (OFCs) provide a broad, stable spectrum of discrete laser lines.

Purpose of the Study:

To demonstrate highly efficient CRDS by coherently coupling an OFC to a high-finesse optical cavity.
To enable simultaneous, broadband, and quantitative spectroscopic measurements.

Main Methods:

Coherent coupling of a broad-bandwidth OFC to a high-finesse optical cavity.
Utilizing 125,000 OFC components for ringdown decay measurements.
Simultaneous spectral coverage across 100 nm in the visible and near-infrared.

Main Results:

Achieved highly efficient CRDS with simultaneous broadband absorption information.
Enabled real-time, quantitative measurements of trace gases (C2H2, O2, H2O, NH3).
Determined molecular transition strengths, linewidths, and population redistributions due to collisions and temperature.

Conclusions:

This OFC-enhanced CRDS technique offers unprecedented sensitivity and spectral coverage for molecular spectroscopy.
It provides a powerful tool for real-time, quantitative analysis of gas-phase species and their dynamics.