Shot noise limited heterodyne detection of CARS signals


Jurna, M. and Búttner, E. and Korterik, J.P. and Otto, C. and Rimke, I. and Offerhaus, H.L. (2008) Shot noise limited heterodyne detection of CARS signals. In: Multiphoton Microscopy in the Biomedical Sciences VIII. Proceedings of SPIE, 6860 . SPIE, 68600R.

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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.
Item Type:Book Section
Copyright:©2008 COPYRIGHT SPIE
Science and Technology (TNW)
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