【作者】 桑梅；

【导师】 李世忱；

【作者基本信息】 天津大学 ， 物理电子学， 2004， 博士

【摘要】 本研究来源于教育部科学技术研究重点项目和国家自然科学基金项目。本论文从准相位匹配技术的理论和实验两个方面，对电场极化反转铁电体的机理和技术关键进行了深入的研究，并在电场周期极化反转KTP晶体制备和PPKTP倍频及光参量振荡等研究方面取得了初步的成果。本文的研究内容突出以下几个方面： (1). 在大量电场致周期极化反转LiNbO3晶体的实验基础上，模拟计算了晶体表面和内部的电场分布，仔细研究了铁电畴反转动力学的基本规律。并获得了与电场极化反转行为相关的PPLN蚀刻表面特征。(2). 用高压电场周期性极化反转磷酸氧钛钾（KTiOPO4，即KTP）晶体取得了初步成功：采用离子交换法，降低了电导率；设计制作了波形可调的高压脉冲电源；制备了一批PPKTP倍频器样品；对PPKTP表面进行化学蚀刻处理，发现反转畴线条笔直，无弯曲变形，边界清晰，基本没有横向扩展。(3). 在理论上研究了PPKTP器件的倍频特性：在光学单通倍频实验中，利用包层泵浦光纤激光器输出的1.064(m的激光作为基频光，泵浦自行制备的PPKTP倍频器件，在室温下获得了连续的0.532(m的明亮绿光输出，倍频转换效率为0.32%, 归一化倍频转换效率为2.4%(W(cm)-1。目前国内还未见其它同类研制成果的报道。(4). 在理论上详细进行了PPKTP光参量振荡的各种调谐与容差特性的研究，结论可以用于指导实验。(5). 研究了利用PPLN产生THz波输出的机理，并用准相位匹配参量振荡原理研究了PPLN THz波产生的调谐与容差特性，理论研究结果与文献已有的实验结果相吻合。说明理论模型是有效的，对今后的研究具有一定的指导意义。更多还原

【Abstract】 This work is supported by both scientific research key project fund of Ministry of Education and national Nature Science Foundation. In this dissertation, the ferroelectric domain inverted dynamics and technology are deeply researched by theoretical and experimental ways. Some primary achievements have been obtained in fabrication and second harmonic generation of periodically poling KTP crystals. Following emphasis contribution are included in this dissertation:Based on lots of electric field inverted LiNbO3 fabrication, the electric field distribution in the crystal is simulated computation. And the ferroelectric domain inverted dynamics is carefully researched. The chemical etched surfaces of PPLN reveal the relative characters of electric poling behavior. Some primary achievements have been got in the fabrication of flux-grown periodically poling KTiOPO4 (PPKTP) by high electrical voltage pulse. Ion-exchange is introduced to decrease the conductivity of KTP crystals. High voltage power is designed and made to generate waveform tunable pulse. Some PPKTP samples are made and the etched surfaces reveal that the inverted domain stripes are straight and no boundaries broadened.The second harmonic generation characteristics of PPKTP are theoretically researched. And in single-pass SHG experiments, the diode-pump double clad fiber laser at 1.064(m was used as fundamental light to pump self-made PPKTP device. Bright green light output was got from it. The SHG efficiency is 0.32% and the normalized SHG efficiency is 2.4%(W(cm)-1. There is no other similar achievement reported in China.The PPKTP optical parametric oscillator tuning and tolerance characteristics are theoretically researched. The conclusions could be used to guide experiments.The principles of THz wave generated from PPLN are researched and the tuning and tolerance characteristics curves are also give based on the method of optical parametric oscillator. The results fit well with some literature data. That means the theoretical model is useful to the further research.更多还原