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Time-resolved coherent anti-Stokes Raman scattering with a femtosecond soliton output of a photonic-crystal fiber

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Abstract

We demonstrate time-resolved coherent anti-Stokes Raman scattering (CARS) by using a frequency-tunable femtosecond soliton output of a silica photonic-crystal fiber (PCF) as a Stokes field. This approach allows quantum beats originating from two close Raman modes to be resolved in the time-domain CARS response. The nonresonant CARS background is efficiently suppressed by introducing a delay time between the probe pulse and the pump–Stokes pulse dyad, suggesting a convenient fiber-optic format for the Stokes source in time–resolved CARS and allowing sensitivity improvement in PCF-based CARS spectroscopes and microscopes.

© 2006 Optical Society of America

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