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Coherent rayleigh scattering

Grinstead¹, Barker

¹Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Physical Review Letters

|September 16, 2000

Summary

This study analyzes coherent scattering in gases at the free-molecule limit. Results show nearly Gaussian spectra, offering new insights into light-matter interactions in rarefied conditions.

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Area of Science:

Physics
Spectroscopy
Gas Dynamics

Background:

Electrostriction induces coherent scattering in gases.
Previous analyses did not cover the free-molecule limit.

Purpose of the Study:

Analyze coherent scattering spectra in the free-molecule limit.
Provide spectrally resolved measurements for this unexplored regime.

Main Methods:

Solved Boltzmann's equation with periodic optical forces.
Analyzed gas spectra under rarefied conditions.

Main Results:

Calculated and measured spectra are nearly Gaussian.
Spectra widths are ~10% wider than spontaneous Rayleigh scattering.
First spectrally resolved measurements in the free-molecule limit.

Conclusions:

Hydrodynamic analysis of stimulated Rayleigh-Brillouin scattering is inapplicable here.
The findings advance understanding of light scattering in rarefied gases.

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