Shot noise limited heterodyne detection of CARS signals

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We demonstrate heterodyne detection of CARS signals using a cascaded phase-preserving chain to generate the CARS input wavelengths and a coherent local oscillator. The heterodyne amplification by the local oscillator reveals a window for shot noise limited detection before the signal-to-noise is limited by amplitude fluctuations. We demonstrate an improvement in sensitivity by more than 3 orders of magnitude for detection using a photodiode. This will enable CARS microscopy to reveal concentrations below the current mMolar range.
Original languageEnglish
Pages (from-to)15207-15213
Number of pages7
JournalOptics express
Issue number23
Publication statusPublished - 2007


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