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Pulsed spontaneous Raman scattering technique for luminous environments.

A J Mulac, W L Flower, R A Hill

|March 6, 2010

Summary

This study presents a new system combining gated photon counting, a cavity-dumped laser, and a multipass cell to significantly improve spontaneous Raman scattering measurements in bright light. The enhanced signal-to-background ratio enables detailed flame analysis.

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Area of Science:

Spectroscopy
Laser Physics
Combustion Diagnostics

Background:

Spontaneous Raman scattering is crucial for analyzing gas composition and temperature.
Luminous background conditions severely limit signal-to-background ratio (SBR) in conventional Raman spectroscopy.
Existing methods struggle to provide accurate measurements in high-background environments like flames.

Purpose of the Study:

To develop and demonstrate a novel system for enhancing spontaneous Raman scattering.
To overcome limitations posed by luminous backgrounds in spectroscopic analysis.
To enable precise temperature and density measurements in challenging environments.

Main Methods:

Integration of a gated photon counting system with a cavity-dumped argon-ion laser.
Utilization of a multipass retroreflecting light cell to increase interaction length.
Application of a passband fitting technique for spectral data analysis.

Main Results:

Achieved a 450-fold improvement in SBR compared to a single-pass continuous-wave system.
Gating and cavity dumping contributed a 30-fold SBR enhancement.
The retroreflecting light cell provided an additional 15-fold SBR improvement.
Successfully obtained temperature and density data from N(2) Q-branch spectra of a methane-air flame.

Conclusions:

The developed system significantly enhances spontaneous Raman scattering in luminous backgrounds.
The combination of techniques offers a powerful tool for combustion diagnostics and other challenging spectroscopic applications.
The passband fitting technique provides a robust method for analyzing complex spectral data.