Single-Beam Coherent Anti-Stokes Raman Scattering Spectroscopy Using Both Pump and Soliton Stokes Pulses from a Photonic Crystal Fiber

Novel single-beam coherent anti-Stokes Raman scattering (CARS) spectroscopy using the combination of a pulse shaper and a photonic crystal fiber (PCF) was demonstrated successfully, where a fundamental soliton Stokes pulse and a spectrally compressed pump pulse were generated in the same PCF. Unlike previous single-beam CARS setups, it can probe C–H stretching vibrations from 2800 to 3100 cm -1 and the resonant Raman C–H stretching vibrations of polystyrene were successfully observed with the single-beam CARS technique.