Shot noise limited heterodyne detection of CARS signals

M. Jurna, E. Búttner, Jeroen P. Korterik, Cornelis Otto, I. Rimke, Herman L. Offerhaus

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Abstract

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 ampli¯cation by the local oscillator re- veals a window for shot noise limited detection before the signal-to-noise is limited by amplitude °uctuations. 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 languageUndefined
Pages-
Publication statusPublished - 2008

Keywords

  • METIS-247762
  • IR-72663

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