Abstract: Optical waveguides in lithium tantalate crystals prepared by nonisovalent ion exchange have been characterized. We found that the waveguides can be formed by ion exchange reactions Me$+2$PLU$/ $YLD 2Li$+$PLU$/ (Me: Ni, Mn, Fe, Co) in the salt melts at the temperatures below the Curie point of lithium tantalate. The fabrication and properties of optical waveguides formed in LiTaO$-3$/ by simultaneous processing of nonisovalent and proton exchange have been also described. A surface increase of the refractive index up to 0.14 was observed for the extraordinary polarization and up to 0.11 for the ordinary polarization. The birefringence and index change of such waveguides can be controlled by varying the melt concentrations. The dynamics of the process is discussed. Rare-earth doping of LiTaO$-3$/ by ion exchange reactions Er$+3$PLU$/ $YLD 3Li$+$PLU$/ and Nd$+3$PLU$/ $YLD 3Li$+$PLU$/ have been obtain at the temperature below the Curie point.!19
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机译：摘要：已经表征了通过非等价离子交换制备的钽酸锂晶体中的光波导。我们发现波导可以通过离子交换反应在居里温度以下的盐熔体中通过Me $ + 2 $ PLU $ / $ YLD 2Li $ + $ PLU $ /（Me：Ni，Mn，Fe，Co）形成点钽酸锂。还描述了通过同时处理非等价和质子交换以LiTaO $ -3 $ /形成的光波导的制造和特性。对于非常偏振，观察到折射率的表面增大至0.14，对于常规偏振，观察到的折射率增大至0.11。可以通过改变熔体浓度来控制这种波导的双折射和折射率变化。讨论了过程的动力学。通过离子交换反应对LiTaO $ -3 $ /进行稀土掺杂Er $ + 3 $ PLU $ / $ YLD 3Li $ + $ PLU $ /和Nd $ + 3 $ PLU $ / $ YLD 3Li $ + $ PLU $ /在低于居里点的温度下获得的!! 19
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