Backconversion in a pulsed optical parametric oscillator: evidence from injection-seeded sidebands

G. W. Baxter, J. G. Haub, B. J. Orr
1997 Journal of the Optical Society of America. B, Optical physics  
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 reduce
more » ... isaligned to reduce its effective finesse), and corresponding sidebands are observed on the transmitted 355-nm pump radiation. This is interpreted as direct evidence of backconversion of signal and idler waves in a pulsed OPO, consistent with previous temporal observations and other aspects of OPO performance. Signal-wave sidebands are observed well beyond the regular free-running OPO gain profile, which is understood in terms of the different phase-matching conditions for the various OPO pump and idler (seed) frequencies that are involved.
doi:10.1364/josab.14.002723 fatcat:bxdja3goefbhzg2w4ypn5ns6my