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.