13 February 2009 Background free CARS imaging by local phase detection
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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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M. Jurna, J. P. Korterik, C. Otto, L. Herek, H. L. Offerhaus, "Background free CARS imaging by local phase detection", Proc. SPIE 7183, Multiphoton Microscopy in the Biomedical Sciences IX, 718310 (13 February 2009); doi: 10.1117/12.807714; https://doi.org/10.1117/12.807714
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