A linear chirp was observed for phase-conjugate picosecond pulses from a resonator-type optical parametric oscillator based on an LiNbO 3 crystal pumped by the second harmonic of a YAG:Nd 3+ laser with active mode locking and switching at repetition frequencies up to 10 kHz. A 20-fold compression of the parametric oscillator pulses to 2.5 psec was achieved.
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Piskarskas et al. (1985) studied this question.