Abstract
Photorefractive effects (PRE) in KTiOPO4 channel waveguides were studied at the wavelengths 0.633 and 0.83 μm. The 4 μm-wide waveguides were fabricated by Rb ion exchange on the z-face of the crystals and along the y axis. At 0.633 μm, crystals from one source showed conventional photorefractive response with a saturation index change Δn of 2×10−5, but samples from a different source were not photorefractive. Neither type of crystals displayed photorefractive behavior in response to 0.83 μm light at guided-wave power flow of 2.4×107 W/m2. Differences in bicrystal structure are suggested as a possible cause of differing PRE between the two samples. On crystals from the first source, the relaxation time of generating PRE is related to power flow of the irradiating beam. The relaxation time of PRE disappearance after stop irradiation is also related to power flow of the irradiating light.
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