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Related Experiment Video

Updated: Jul 14, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Fourier-transform cavity-enhanced absorption spectroscopy using an incoherent broadband light source.

Albert A Ruth¹, Johannes Orphal, Sven E Fiedler

¹Department of Physics, National University of Ireland, University College Cork, Cork, Ireland. a.ruth@ucc.ie

|May 22, 2007

Summary

Cavity-enhanced absorption spectroscopy significantly boosts Fourier-transform spectrometer sensitivity for measuring oxygen and water vapor. This technique enhances path length by 200x, improving signal-to-noise for gas analysis.

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A Multimodal Wide-Field Fourier-Transform Raman Microscope

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

A Multimodal Wide-Field Fourier-Transform Raman Microscope

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Area of Science:

Spectroscopy
Atmospheric Chemistry
Physical Chemistry

Background:

Fourier-transform spectroscopy (FTS) is a powerful tool for gas analysis.
Measuring weak absorption features, like the spin-forbidden B-band of oxygen, requires high sensitivity.
Traditional FTS methods can be limited by path length and signal-to-noise ratios.

Purpose of the Study:

To enhance the sensitivity of Fourier-transform spectroscopy for gas-phase measurements.
To measure weak absorption transitions of gaseous oxygen and water vapor.
To evaluate the effectiveness of cavity-enhanced absorption spectroscopy (CEAS) for this purpose.

Main Methods:

Utilized a cavity-enhanced absorption setup with an incoherent broadband light source.
Combined CEAS with a Fourier-transform spectrometer.
Operated at room temperature in ambient air to measure absorption spectra around 688 nm.

Main Results:

Achieved a path-length enhancement factor of 200 compared to single-pass measurements.
Reported an approximate 6-fold improvement in the signal-to-noise ratio.
Successfully measured the spin-forbidden B-band of oxygen and weak water vapor transitions.

Conclusions:

Cavity-enhanced absorption spectroscopy significantly improves FTS sensitivity.
The method allows for sensitive gas measurements with a small sample volume.
This technique offers practical advantages for atmospheric and chemical analysis.