Second-order optical non-linearity of proton exchanged lithium tantalate waveguides |
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Authors: | Y.N. Korkishko V.A. Fedorov A.N. Alkaev F. Laurell |
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Affiliation: | (1) Moscow Institute of Electronic Technology, Department of Materials and Technology of Solid-State Electronics, 103498 Moscow, Zelenograd, Russia, RU;(2) Department of Laser Physics and Quantum Optics, Royal Institute of Technology, Stockholm, Sweden, SE |
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Abstract: | A detailed correlation between the fabrication conditions, crystallographic phase state of HxLi1-xTaO3 waveguides and second-order optical non-linearity has been investigated by using reflected SHG measurements from the polished waveguide end face. The non-linearity, strongly reduced after the initial proton exchange, is found to be restored and even increased after annealing. However, this apparent increase in the non-linearity is accompanied by a strong degradation of the quality of the SHG reflected beam in the region of the initial as-exchanged waveguide due to beam scattering. The high temperature proton exchange technique has been shown to produce high-quality α-phase waveguides with essentially undegraded non-linear optical properties. There is no phase transition when the α-phase waveguides are fabricated by direct exchange. This phase presents the same crystalline structure as that of LiTaO3 and maintains the excellent non-linear properties of the bulk material. The results obtained are important for the design, fabrication and optimization of guided-wave non-linear optical devices in LiTaO3. Received: 21 May 2001 / Published online: 23 October 2001 |
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Keywords: | PACS: 42.70.M 42.65.K 42.82.E 77.84.Dy |
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