Background free CARS imaging by phase sensitive heterodyne CARS


Jurna, M. and Korterik, J.P. and Otto, C. and Herek, J.L. and Offerhaus, H.L. (2008) Background free CARS imaging by phase sensitive heterodyne CARS. Optics Express, 16 (20). pp. 15863-15869. ISSN 1094-4087

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Abstract:In this article we show that heterodyne CARS, based on a controlled and stable phase-preserving chain, can be used to measure amplitude and phase information of molecular vibration modes. The technique is validated by a comparison of the imaginary part of the heterodyne CARS spectrum to the spontaneous Raman spectrum of polyethylene. The detection of the phase allows for rejection of the non-resonant background from the data. The resulting improvement of the signal to noise ratio is shown by measurements on a sample containing lipid.
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Additional information:Open access article
Copyright:© 2008 Optical Society of America
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