Pulse Measurement from a Polluted Frequency Resolved Optical Gating Trace Based on Half-Trace Retrieval Algorithm

A half-trace retrieval algorithm based on an extended-ptychographical iterative engine is proposed to reconstruct the temporal structure of pulse from a polluted and recorded frequency-resolved optical gating (FROG) trace that was modulated by poor spatial profile output pulses, stray light, or misalignment measurement setup. In algorithm, probe gated were retrieved simultaneously FROG with half-delay range, measured obtained combining different edges pulse. Numerical simulations carried out verify feasibility algorithm. single-shot picoseconds (ps)−THG−FROG setup 100-μJ ps laser system online ps−SHG−FROG in PW built test experimentally. The results show pulses closer real than conventional ptychographical when badly polluted.