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Second harmonic generation into the near ultraviolet in Zr-diffusion-doped lithium tantalate ridge waveguides

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We report on the efficient second harmonic generation at a near-UV wavelength of 399.7 nm in periodically poled Zr-doped LiTaO3 waveguides. High-temperature in-diffusion of ZrO2 layers into congruent LiTaO3 substrates with simultaneous improvement of crystal s... ...