Comparison between copropagative and counterpropagative non-degenerated cascaded parametric interactions

摘要

We show that, in a χ~(2) material, a backward injected signal beam undergoes an automatic π phase shift in a phase-matched cascaded parametric interaction in the presence of a forward injected pump beam. This type of interaction, compared with the previously proposed copropagative cascaded parametric interaction configurations, is shown to have more flexibility for signal processing.