Background free CARS imaging by phase sensitive heterodyne CARS

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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.
Original languageEnglish
Pages (from-to)15863-15869
Number of pages7
JournalOptics express
Issue number20
Publication statusPublished - 2008

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