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Four-wave mixing using polarization grating induced thermal grating in liquids exhibiting circular dichroism

By J.A. Nunes, W.G. Tong, D.W. Chandler and L.A. Rahn


A novel four-wave mixing technique for the detection of circular dichroism in optically active liquid samples is demonstrated. When two cross-polarized laser beams are crossed at a small angle in a circular dichroic liquid a weak thermal grating is produced with a phase depending on the sign of the circular dichroism. The authors show that the polarization of one of the beams can be modified to allow coherent interference with an intensity-grating induced thermal grating. A probe beam scattering from the composite grating results in a signal that reveals the sign and magnitude of the circular dichroism. The use of this technique to optimize the signal-to-noise ratio in the presence of scattered light and laser intensity noise is discussed

Topics: Laser Radiation, Gratings, Dichroism, Frequency Mixing, Structural Chemical Analysis, 40 Chemistry, Liquids
Publisher: Sandia National Laboratories
Year: 1995
DOI identifier: 10.2172/481612
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Provided by: UNT Digital Library
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