Shot noise limited heterodyne detection of CARS signals


Jurna, M. and Korterik, J.P. and Otto, C. and Offerhaus, H.L. (2007) Shot noise limited heterodyne detection of CARS signals. Optics Express, 15 (23). pp. 15207-15213. ISSN 1094-4087

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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 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.
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Additional information:Open access article
Copyright:© 2007 Optical Society of America
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