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Related Experiment Video

Updated: Jun 26, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Optical feedback cavity enhanced absorption spectroscopy with diode lasers.

Stuart G Baran¹, Gus Hancock, Robert Peverall

¹Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UKOX1 3QZ.

|January 29, 2009

Summary

A new optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) system uses a diode laser for highly sensitive measurements. This technique accurately detects water and carbon dioxide isotopologues, demonstrating its practical application.

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Area of Science:

Spectroscopy
Laser Physics
Environmental Monitoring

Background:

Cavity-enhanced absorption spectroscopy (CEAS) offers high sensitivity for gas analysis.
Optical feedback mechanisms can improve laser performance for spectroscopic applications.

Purpose of the Study:

To develop and demonstrate an optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) apparatus.
To assess the sensitivity and practicality of the OF-CEAS technique for gas concentration measurements.

Main Methods:

Development of an OF-CEAS system utilizing a distributed feedback diode laser near 1596 nm.
Implementation of optical feedback from a V-shaped cavity to injection seed the laser diode, achieving linewidth narrowing and frequency locking.
Measurement of water and carbon dioxide absorptions using the developed OF-CEAS apparatus.

Main Results:

Demonstrated the expediency and sensitivity of the OF-CEAS technique.
Successfully measured aerial water absorptions near 6260.8 cm(-1).
Quantified carbon dioxide absorptions near 6261.7 cm(-1) for isotopologue concentration analysis.
Achieved a minimum detectable absorption coefficient of 5.8 x 10(-9) cm(-1) s(1/2) with a cavity finesse of approximately 3500.

Conclusions:

The developed OF-CEAS system is a sensitive and practical tool for spectroscopic gas analysis.
The technique is suitable for measuring concentrations of different CO2 isotopologues.
OF-CEAS shows promise for applications in environmental monitoring and isotopic analysis.