Department of Physics2024-11-1019961077-260X10.1109/2944.5773992-s2.0-0030156097http://dx.doi.org/10.1109/2944.577399https://hdl.handle.net/20.500.14288/17090Tuning curves and gain are two relevant parameters for integrated optical parametric oscillators. We show in this paper that they can be determined with a good precision without building a high-finesse cavity by measurement of the optical parametric fluorescence and difference-frequency generation. In the first part of this paper, we compare theoretically the guided optical parametric fluorescence and the guided difference-Frequency generation in the quasi-phase matching configuration. In the second part, we compare experimental results on optical parametric fluorescence in the 1.2-2.2-μm region and optical difference-frequency generation from a 1.55-μm laser diode using a pump wavelength between 775-795 nm in quasi-phase-matched lithium niobate stripe waveguides. This comparison shows that the gain measured by both methods is identical, but, while parametric fluorescence allows us to obtain the quasi-phase-matching curve, the difference-frequency generation gives a simpler and more accurate measurement of the gain. The combination of these two techniques provides therefore a powerful tool for evaluating the different fabrication processes of the nonlinear waveguides, without actually fabricating a parametric oscillator.PhysicsReviewhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0030156097anddoi=10.1109%2f2944.577399andpartnerID=40andmd5=ba615d93aa12cba0fad4406265973d06Q18039