Abstract

We present the design and characteristics of a KTiOPO4 singly resonant optical parametric oscillator synchronously pumped by the second harmonic of an additive-pulse mode-locked Nd:YLF laser. The pump pulses at the 527-nm wavelength have a pulse width of 4.5 ps, a repetition rate of 76 MHz, and an average power of as much as 4 W. Above the threshold of 900-mW average pump power, continuous tuning is demonstrated from 851 to 938 nm in the signal branch and from 1200 to 1381 nm in the idler branch. At three times the threshold, 3.2-ps signal pulses with an average power of 83 mW and 2.4-ps idler pulses with an average power of 280 mW are obtained. High-order transverse-mode characteristics and multiple-wavelength oscillation are also discussed.

© 1995 Optical Society of America

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