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Abnormal anti-Stokes Raman emission as single beam coherent anti-Stokes Raman scattering like process in LiNbO3 and CdS powder

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3 Author(s)
Baibarac, Mihaela ; National Institute of Materials Physics, P.O. Box MEG-7, Bucharest, R-77125, Romania ; Baltog, Ioan ; Lefrant, Serge

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Abnormal anti-Stokes Raman emission (AASRE) is defined by an anti-Stokes/Stokes intensity ratio much greater than expected on the basis of the equilibrium population of excited vibration states provided by the Boltzmann law. Using nonlinear optical materials such as LiNbO3 and CdS in powder form, we demonstrate that under continuous single beam excitation it presents AASRE whose properties are similar to a single beam pumped Coherent Anti-Stokes Raman Scattering. We explain AASRE as resulting from a wave-mixing mechanism of the incident laser light with a Stokes shifted Raman light produced by a spontaneous Raman light scattering process, both strongly scattered inside the sample.

Published in:

Journal of Applied Physics  (Volume:110 ,  Issue: 5 )

Date of Publication:

Sep 2011

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