| Summary: | 碩士 === 國立臺灣大學 === 光電工程學研究所 === 92 === This dissertation is organized into three parts: (i)an introduction to the theory of quasi-phase matching,(ii)the fabrication of two-dimensional periodically poled nonlinear crystal(2D NPC) ,and (iii) the high temperature process of lithium tantalate.
At first, the theory of nonlinear frequency conversion and quasi-phase matching is briefly introduced.
And then, several fabrication processes are introduced, including using the high permittivity material as insulator to make periodically poled structure, and using the surface domain inversion to make periodically poled structure. By doing so, a 500um thickness two dimensional periodically poled lithium niobate with 29.5um period and 12mm effective length is made.
Finally, the coercive field of lithium tantalite is observed dramatic decrease in the high temperature fabrication process. It provides the possibility to fabricate thicker 2D NPC at an elevated temperature.
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