Abstract
High spectral resolution coherent anti-Stokes Raman scattering (CARS) spectroscopy and microscopy are demonstrated with femtosecond laser systems. We perform optimal chirping in glass fibers and demonstrate a spectral resolution enhancement to better than 26 cm−1, which is limited by the bandwidth of the measured resonances. Considering the convolution with the resonance bandwidth this corresponds to a spectral resolution of approximately 2.5 cm−1, which is an enhancement by a factor of 165 with respect to the use of bandwidth-limited pulses. In microscopic imaging, a water background suppression of 81.5% is achieved.
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Cleff, C., Groß, P., Kleinschmidt, L. et al. Optimally chirped CARS using fiber stretchers. Appl. Phys. B 105, 801–805 (2011). https://doi.org/10.1007/s00340-011-4751-5
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DOI: https://doi.org/10.1007/s00340-011-4751-5