title: Highly sensitive ultrafast pulse characterization using hydrogenated amorphous silicon waveguides.
abstract: We experimentally demonstrate frequency resolved optical gating (FROG) via four-wave mixing (FWM) in ultrahigh nonlinearity hydrogenated amorphous silicon waveguides. We demonstrate FROG characterization using a FWM architecture that mimics second harmonic generation (SHG) FROG for pulsewidths as low as 360 fs. Additionally, we demonstrate for the first time a FWM architecture analogous to third harmonic generation (THG) FROG and validate its ability to overcome the direction of time ambiguity of the SHG-like architecture. Both architectures allow for sensitivities suitable for future telecommunications signals.
authors: Keith G
authors: KG
authors: Petrillo
authors: Ke-Yao
authors: KY
authors: Wang
authors: Amy C
authors: AC
authors: Foster
authors: Mark A
authors: MA
authors: Foster