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Opt Lett. 2009 Nov 1;34(21):3262-4. doi: 10.1364/OL.34.003262.

Fiber-format CARS spectroscopy by spectral compression of femtosecond pulses from a single laser oscillator.

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


We demonstrate an approach to coherent anti-Stokes Raman scattering (CARS) spectroscopy/microscopy based on spectral compression of femtosecond pulses emitted by a compact Er-fiber oscillator. Spectral compression is achieved by group-velocity mismatched second-harmonic generation in periodically poled nonlinear crystals, and it allows efficient synthesis of synchronized narrow-bandwidth (less than 10 cm(-1)) pump and Stokes pulses with the frequency difference continuously tunable up to approximately 3000 cm(-1). CARS signal enhancement by up to 3 orders of magnitude is obtained by interferometric superposition with a phase-coherent local oscillator field, also synthesized by spectral compression.

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