Broadband stimulated Raman scattering microscopy with wavelength-scanning detection
Online Publication Date2020-01-03
Print Publication Date2020-10
Embargo End Date2021-01-03
Permanent link to this recordhttp://hdl.handle.net/10754/661428
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AbstractWe introduce a high-sensitivity broadband stimulated Raman scattering (SRS) setup featuring wide spectral coverage (up to 500 cm−1) and high-frequency resolution (≈20 cm−1). The system combines a narrowband Stokes pulse, obtained by spectral filtering an Yb laser, with a broadband pump pulse generated by a home-built optical parametric oscillator. A single-channel lock-in amplifier connected to a single-pixel photodiode measures the stimulated Raman loss signal, whose spectrum is scanned rapidly using a galvanometric mirror after the sample. We use the in-line balanced detection approach to suppress laser fluctuations and achieve close to shot-noise-limited sensitivity. The setup is capable of measuring accurately the SRS spectra of several solvents and of obtaining hyperspectral data cubes consisting in the broadband SRS microscopy images of polymer beads test samples as well as of the distribution of different biological substances within plant cell walls.
CitationDe la Cadena, A., Valensise, C. M., Marangoni, M., Cerullo, G., & Polli, D. (2020). Broadband stimulated Raman scattering microscopy with wavelength-scanning detection. Journal of Raman Spectroscopy. doi:10.1002/jrs.5816
SponsorsWe acknowledge support from the following funding agencies: European Research Council (Consolidator Grant VIBRA, ERC-2014-CoG 648615), Horizon2020 (GRAPHENE Flagship, project 785219), and KAUST (project OSR-2016-CRG5-3017-01).
JournalJournal of Raman Spectroscopy
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