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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/075/06/1129-1134

    • Keywords

       

      Coherent anti-Stokes Raman scattering; nonlinear spectroscopy; coherent spectroscopy; interferometric CARS.

    • Abstract

       

      We demonstrate a new approach to CARS spectroscopy by efficiently synthesizing synchronized narrow-bandwidth (less than 10 cm-1) pump and Stokes pulses (frequency difference continuously tunable upto $\sim 3000$ cm-1) based on spectral compression together with second harmonic generation (in periodically-poled nonlinear crystals) of femtosecond pulses emitted by a single compact Er-fibre oscillator. For a far better signal to non-resonant background contrast, interferometric CARS (I-CARS) is demonstrated and CARS signal enhancement upto three orders of magnitude is achieved by constructive interference with an auxiliary local oscillator at anti-Stokes field, also synthesized by spectral compression of pulses emitted from the same fibre oscillator.

    • Author Affiliations

       

      Vikas Kumar1 Alessio Gambetta1 Cristian Manzoni1 Roberta Ramponi1 Giulio Cerullo1 Marco Marangoni1

      1. Dipartmento di Fisica-Politecnico di Milano, ULTRAS-CNR-INFM, IFN-CNR, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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