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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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Published on: March 22, 2019

Phase-shift cavity ring-down spectroscopy using mid-IR light from a difference frequency generation PPLN waveguide.

Roberto Grilli¹, Luca Ciaffoni, Andrew J Orr-Ewing

¹School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.

|May 4, 2010

Summary

Mid-infrared light generated by difference frequency generation (DFG) was used for sensitive ethene detection. This technique demonstrated a minimum absorption coefficient of 1.4 x 10(-7) cm(-1), showing potential for trace gas analysis.

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Area of Science:

Spectroscopy
Molecular Physics
Laser Spectroscopy

Background:

Cavity ring-down spectroscopy (CRDS) is a highly sensitive technique for measuring trace gases.
Mid-infrared (mid-IR) light sources are crucial for probing molecular vibrational modes.

Purpose of the Study:

To demonstrate the application of difference frequency generation (DFG) in a periodically poled lithium niobate (PPLN) waveguide for phase-shift cavity ring-down spectroscopy (PS-CRDS).
To detect ethene using specific rotational lines of its nu(9) fundamental vibrational band.
To assess the sensitivity and potential of the developed DFG-based PS-CRDS system for trace gas detection.

Main Methods:

Generation of approximately 200 microW of mid-IR light around 3081 cm(-1) via DFG in a PPLN crystal waveguide.
Utilizing phase-shift cavity ring-down spectroscopy (PS-CRDS) to probe overlapping rotational lines of ethene ((12)C(2)H(4)) and its isotopologue ((12)CH(2)(13)CH(2)).
Demonstrating ethene detection by measuring absorption coefficients.

Main Results:

Successful probing of overlapping rotational lines of ethene and its isotopologue at 3081.0016 cm(-1).
Demonstrated ethene detection with a minimum absorption coefficient of 1.4 x 10(-7) cm(-1).
Achieved this sensitivity with an acquisition time of approximately 4 minutes.

Conclusions:

The compact DFG system, tunable over >35 cm(-1), is effective for PS-CRDS.
The developed system shows significant potential for sensitive trace gas detection and molecular spectroscopy applications.
This approach offers a promising tool for various analytical and research fields requiring high-sensitivity gas analysis.