Abstract
Periodic structuring of ferroelectric domains in 2mol% Rb-doped KTP is demonstrated using a room-temperature electric-field poling. Drastically reduced ionic conductivity in this material, or 2-orders of magnitude lower than in flux-grown KTP, makes it a good candidate for fabrication of quasi-phase-matched frequency converters. A coercive field of 3.4kV/mm has been measured at room temperature. The dispersion of the index of refraction and effective nonlinearity in quasi-phase-matched structures in Rb-doped KTP did not show significant difference from KTP. A normalized conversion efficiency of 2.5%W−1cm−1 for the frequency-doubling of 908.4nm has been obtained. A singly-resonant mid-infrared optical parametric oscillator with periodically-poled Rb-doped KTP generating 1.53μm signal and 3.49μm idler had threshold of 51MW/cm2 which is comparable to the best-quality periodically-poled KTP structures in the same optical cavity.
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