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A pulsed optical parametric oscillator (OPO) is pumped at 355 nm and injection seeded at two distinct idler wavelengths at ϳ855 nm; these are separated by a frequency interval ⌬ falling within the 350-GHz freerunning OPO bandwidth. Above-threshold operation of this dual-frequency seeded OPO causes sidebands to be observed at multiples of ⌬ in the spectrum of the 607-nm signal radiation. The sideband spacing varies smoothly as ⌬ is tuned (with the injection-seeded OPO cavity misaligned to reducedoi:10.1364/josab.14.002723 fatcat:bxdja3goefbhzg2w4ypn5ns6my