| Summary: | 碩士 === 國立臺灣大學 === 光電工程學研究所 === 91 === This thesis is organized in to three parts : (1) the theory of second harmonic generation (SHG) by using two-dimentional nonlinear photonic crystal and quasi-phase match method, and (2)the fabrication of 1D and 2D periodically poled lithiμm niobate , and (3) the optical measurements , including temperature-resolved, angle-resolved, and wavelength-resolved SHG experiments.
Several fabrication methods are used and compared. 1D PPLN with and 6.8μm period and 2D PPLN with 20x20μm period are successfully made. In particular, 6mm efficient length for the 2D PPLN is achieved, and the domain patterns are regular and fine over the whole range under O-ring.
In the measurements , the results of temperature, angle, and wavelength tuning experiments agree well with theoretical prediction. In the wavelength-tuning experiment, 33% external efficiency and about 50% internal efficiency are achieved. Infrared ray laser (second harmonic), blue and green laser (third harmonic) and ultraviolet laser (fourth harmonic) are generated and observed simultaneously.
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