Study of the periodically poled lithium tantalite crystal

• Main Authors: Wei-Jeng Wu, 吳韋正
• Other Authors: Huai-Yi Chen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/96259261758385834645

碩士 === 華梵大學 === 電子工程學系碩士班 === 94 === The purpose of this thesis is to study the periodically poled ferroelectric domain of the z-cut lithium tantalate. We try to investigate characteristics and reverse mechanism of ferroelectric domains, and to handle the technique of reverse poling. We would like to control the growth or side growth of ferroelectric domain and to implement the complete reverse structure of periodicity. In order to manufacture the reverse periodic ferroelectric domain structure on the lithium tantalate crystal, we used lift-off method to make the periodic electrode of the chromium (Cr) in lithography. We would describe the detail such as sputtering, etching of chromium (Cr) metal, and fabrication of dielectric layer. Besides, we found the regularity to design the profile of reverse poling voltage, the magnitude of reverse voltage and duration of reverse time. It is easy to find the optimal condition of the periodic reverse ferroelectric domain. In the thesis we take the chromium metal as the periodic electrode, and successfully manufacture periodically poled reverse structure (period with duty cycle~50%)on the z-cut lithium tantalate crystal of 300μm in thickness. This technology established will help a lot in the application to the nonlinear frequency conversion of light wave.