In-line balanced detection stimulated Raman scattering microscopy
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AbstractWe introduce a novel configuration for stimulated Raman scattering (SRS) microscopy, called In-line Balanced Detection (IBD), which employs a birefringent plate to generate a time-delayed polarization-multiplexed collinear replica of the probe, acting as a reference. Probe and reference cross the sample at the same position, thus maintaining their balance during image acquisition. IBD can be implemented in any conventional SRS setup, by adding a few simple elements, bringing its sensitivity close to the shot-noise limit even with a noisy laser. We tested IBD with a fiber-format laser system and observed signal-to-noise ratio improvement by up to 30 dB.
CitationCrisafi F, Kumar V, Scopigno T, Marangoni M, Cerullo G, et al. (2017) In-line balanced detection stimulated Raman scattering microscopy. Scientific Reports 7. Available: http://dx.doi.org/10.1038/s41598-017-09839-1.
SponsorsThis work has been supported by European Research Council Consolidator Grant VIBRA (ERC-2014-CoG 648615), Horizon2020 GRAPHENE Flagship (696656) and KAUST (OSR-2016-CRG5-3017-01). We thank Andrea Ragni for his help in detector noise measurements and calculations. Abigail D.G. Nunn, L. Belloni and N. Pediconi are kindly acknowledged for providing HepaRG and HuH7 cell lines.