title: Ultra-broadband pulse evolution in optical parametric oscillators.
abstract: Ultrashort-pulse evolution inside a optical parametric oscillator is described by using a nonlinear-envelope-equation approach, eliminating the assumptions of fixed frequencies and a single χ((2)) process associated with conventional solutions based on the three coupled-amplitude equations. By treating the interacting waves as a single propagating field, the experimentally-observed behaviors of singly and doubly-resonant OPOs are predicted across near-octave-spanning bandwidths, including situations where the nonlinear crystal provides simultaneous phasematching for multiple nonlinear processes.
authors.affiliation: Scottish Universities Physics Alliance (SUPA), Department of Physics, School of Engineering and Physical Sciences, Heriot-Watt University, Riccarton, Edinburgh, UK. D.T.Reid@hw.ac.uk
authors.forename: Derryck T
authors.initials: DT
authors.lastname: Reid