| Summary: | 碩士 === 國立臺灣大學 === 光電工程學研究所 === 96 === In this thesis, the theory of quasi-phase-matching (QPM) and nonlinear optical generation and the fabrication techniques of periodically poled ferroelectric nonlinear crystals will be first introduced. I then will emphasize on the nickel-diffusion assisted electric poling method that leads to the realization of periodically poled QPM structures of 20 mm length on 0.5 mm thick congruent-grown lithium tantalate (PPCLT) substrates. The QPM-based PPCLT chips with periodicity of 12.78, 7.76, and 5.15 micrometer suitable for producing second harmonic generation (SHG) of red, green, and blue lasers and for optical parametric oscillator (OPO) of near infrared lasers have been demonstrated and characterized. Finally a green pumped cascaded OPO-SHG blue laser with double-periodicity of 7.76 and 4.99 micrometer in PPCLT will be demonstrated and discussed.
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