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Phys. Rev. A 77, 061802(R) (2008) [4 pages]

Focused field symmetries for background-free coherent anti-Stokes Raman spectroscopy

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David Gachet*, Franck Billard†, and Hervé Rigneault‡
Institut Fresnel UMR CNRS 6133, Mosaic group, Université Paul Cézanne Aix-Marseille III, Domaine Universitaire Saint Jérôme, 13397 Marseille Cedex 20, France

Received 16 November 2007; published 2 June 2008

Spatial symmetries inherent to tight focus optical beams are applied to control the field phase generated at interfaces in nonlinear optical processes. We use these symmetries to obtain a background-free pure Raman spectrum in coherent anti-Stokes Raman scattering spectroscopy from a resonant medium forming a transverse interface with a nonresonant medium. We demonstrate that the nonresonant medium acts as a local oscillator with which the Raman spectrum is measured in heterodyne detection. This method is relevant to remove the nonresonant background in other third-order resonant processes excited with focused beams.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.061802
DOI:
10.1103/PhysRevA.77.061802
PACS:
42.65.Dr, 42.25.Gy, 78.30.Cp, 82.53.Kp

*Present address: Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.

†Present address: Institut Carnot de Bourgogne, UMR CNRS 5209, Département “Optique, interaction Matière-Rayonnement”, Université de Bourgogne, 9, Avenue Savary, BP 47 870, 21708 Dijon Cedex, France.

‡herve.rigneault@fresnel.fr; URL: http://www.fresnel.fr/mosaic/

 
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