Group-velocity-matched optical parametric oscillator in tilted quasi-phase-matched gratings.
An achromatic phase-matching scheme is reported for an optical parametric oscillator in tilted quasi-phase-matched gratings. The spectral angular dispersion is introduced in interaction waves such that each wave component satisfies the two-dimensional (noncollinear) quasi-phase matching. This is equivalent to simultaneous quasi-phase matching and group-velocity matching for ultrashort pulses. The phase-matching bandwidth for 10 mm periodically poled KTP increases by a factor of 12 at lambdas = 1.7 microm compared with one-dimensional quasi-phase matching. The effective interaction length will increase as a result of the matching.
Zhang
Wei Quan
WQ
Department of Physics, Zhejiang Sci-Tech University, Hanghou Zhejiang 310033, China. mike@hosonic.com.cn