Pulse compression and slow-light enhanced three-photon absorption in GaInP photonic crystal waveguides

We demonstrate first observations of slow-light enhanced three-photon absorption(ThPA) in photonic crystal waveguides.The injected pulses demonstrate self-phase modulation(SPM) with scalings deviating from n g 2 (SPM) and n g 3 (ThPA).A thorough analysis suggests pulse compression leading to increased peak powers.