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Evaluation of turbulence induced noise in coherent anti-Stokes Raman scatteringThe effect of turbulence in a transonic wind tunnel on coherent anti-Stokes Raman scattering is considered. The driving pump and Stokes waves are taken to be coaxially propagating Gaussian beam waves which are focused on the Raman active medium through the turbulent boundary layer of the flow tube. The random index of refraction variations in the layer are modeled as phase perturbations of the driving waves which cause a reduction of the mean on-axis field and an increase in the mean diameter of the beams. Effective Gaussian beam parameters are developed and the radiated anti-Stokes power calculated as a function of the phase screen parameters. A significant reduction in signal strength occurs for realistic estimates of the phase screen parameter appropriate to a confined transonic flow. A method for estimating the signal degradation which could be applied to other experimental situations is presented.
Document ID
19840009947
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Elliott, R. A. (Oregon Graduate Center for Study and Research Beaverton, OR, United States)
Date Acquired
September 4, 2013
Publication Date
December 31, 1982
Subject Category
Acoustics
Report/Patent Number
NAS 1.26:166544
NASA-CR-166544
Accession Number
84N18015
Funding Number(s)
CONTRACT_GRANT: NSG-2387
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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