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
μm compared with one-dimensional quasi-phase matching. The effective interaction length will increase as a result of the matching.
© 2006 Optical Society of America
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