【作者】 付伟佳；

【导师】 于建；

【作者基本信息】 天津大学 ， 物理电子学， 2007， 硕士

【摘要】 本课题来源于国家自然科学基金资助项目。论文对准相位匹配技术的基本原理进行了理论分析,并对KTP晶体电致极化反转的原理和工艺进行深入的研究。本文对周期极化KTP(PPKTP)晶体的研制过程进行了详细的分析,自行研制了新型极化电源,确定并优化了影响KTP极化反转质量的关键参数,力图提高PPKTP晶体极化反转的质量。分别在理论和实验两方面对PPKTP倍频特性进行了详细的描述和分析。本文的主要工作如下:1.对准相位匹配技术的基本原理及准相位匹配的倍频特性进行了理论分析,研究了KTP晶体的介电特性、光学特性和光损伤特性等主要性质。2.设计并研制出可产生所设计波形、序列脉冲方波和波形脉宽可设的任意波形高压脉冲电源。3.分析了KTP晶体极化过程中畴壁运动的机理,通过对畴壁运动速率和周期电极结构的静电场计算,进行了极化参数的选择与优化,在实验中采用了高电压场与低电压场相结合的极化反转方案。4.利用电光效应实时监控、倍频通光二维监控相结合的监控方法,优化了光栅电极面的选择,用液体电极方案的外加电场极化法制备出均匀和扇形周期结构的PPKTP倍频器件。5.研究了周期极化KTP调谐与容差特性及倍频转换的调谐方案。在光学单通倍频实验中,利用1.064μm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13mw以上的连续0.532μm绿光输出,单通归一化倍频转换效率为1.69%/W?cm,接近理论的最大值;分析并优化了用于PPKTP晶体倍频的对称共焦腔的参数,利用设计的对称共焦腔实现了自制PPKTP器件输出70mW的0.532μm连续倍频绿光,倍频转换效率为8.7%。目前国内未见研制PPKTP器件的报道,我们研究工作取得的成果填补了国内空白。更多还原

【Abstract】 This work is supported by national Nature Science Foundation. In this dissertation, quasi-phase-matched technology is researched in theoretical ways. The properties and analysis of periodically poling of KTP crystal are obtained through experimental research. Investigation on the theory and technique of domain inversing is the basis of fabrication of KTP with ideal inversed domain structures. The focus of this dissertation is to develop strategies for the fabrication of PPKTP through investigating the electric field periodic poling process in KTP, and to improve the quality of domain-reversal processes through identifying and optimizing those parameters contributing most significantly to the quality of KTP. Major contributions are as follows:1. quasi-phase-matched technology is researched in theoretical ways. The major concepts, such as spontaneous polarization, pyroelectric effect, piezoelectricity etc.,are described.2. A new type of poling voltage waveform for the fabrication of Periodically Poled KTP by electric field poling method was presented and the related high voltage power supply was designed .This power supply can output trapezoid waveform, periodic square waveform and others generated by these two waveforms.3. The domain switching process and characteristics of periodically poled KTP was analyzed, and based on which important factors in fabrication such as choosing electrode and the design of poling waveforms are identified. These analyses provide the basis for the development of poling methods.High voltage used together with low voltage has been utilized.4. The work shows that the in-situ SHG technique used together with electro-optic monitoring, makes it possible to obtain reliable, real-time information regarding the poling quality over the whole crystal aperture during the electric-field poling process. Uniform and fan structure periodically poled KTP crystals are successfully fabricated by using of liquid electrode scheme in external electrical field poling method.5. The confocal cavity a used in SHG are analysized and optimizing condition is discussed. The SHG output of self-made PPKTP reached 70mW at 532nm which is the best in present reported results and the conversion efficiency was 8.7%. The calculated single-passed normalized conversion efficiency was 1.69%/W·cm. As we known, there is no other similar achievement reported in China.更多还原