title: Interferometric nonlinear mixing in multiple-pass femtosecond optical parametric amplification.
abstract: We demonstrate that in multi-stage optical parametric amplifiers, spatial and temporal overlap of all products and pump on subsequent passes lead to strongly phase-dependent conversion, which has important consequences for output noise and beam profile characteristics. We verify a simple method to avoid this interferometric process.
authors.forename: J
authors.initials: J
authors.lastname: Fraser
authors.forename: K
authors.initials: K
authors.lastname: Hall