Periodically poled lithium niobate (PPLN) is an attractive nonlinear medium on account of its very large effective nonlinearity (deff) and the fact that, with suitable period it can provide non-critical phase-matching for generation of any wavelengths in its transmission range. Optical parametric oscillators (OPO), Q-switched1,2 and quasi-cw pumped,3 in bulk PPLN have been recently reported. In the picosecond regime, the large dispersion of PPLN limits the effective crystal length (leff). Despite this, the product of deffleff for PPLN compares favorably with KTP and LBO. An indication of the effectiveness of PPLN for frequency conversion of picosecond pulses has recently been demonstrated with ~65% SH efficiency from 2.6 psec pulses at a fundamental wavelength of 1.047 µm4.Here we report the first (to the authors’ knowledge) operation of a PPLN synchronously pumped OPO.

© 1996 Optical Society of America

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