Research on efficient conversion and control of optical-wave states by waveguide nonlinear-optic devices

对波导型非线性光学器件实现光波态的有效转换和控制进行了理论分析和实验研究。主要研究结果如下：1.建立和改进了制作波导非线性光学器件的基本工艺。用波纹电极、液体电极和硅压模电极制作准相位匹配的铁电磁畴倒置光栅的方法有很多。2实际设计、制作和评价了不同波长区域的光学二次谐波产生器件、和频产生器件和差频产生器件。讨论了差频产生器件作为光通信波长转换器件的应用，并进行了实验验证。3…对各种非线性光学器件中光波的量子态转换和控制进行了较为系统的理论分析，阐明了光波压缩态的产生和波长转换等光波态转换和控制的特点。利用制作的器件、低噪声外腔可调谐半导体激光器作为泵浦光源和平衡探测器进行了量子噪声测量，得到了利用波导二次谐波器件产生压缩光的初步结果。4.对波导非线性光学器件的超快光学控制进行了理论和实验研究。提出了一种利用准相位匹配和频产生器件进行高速光学采样的方案。利用设计和制作的器件实现了有效的皮秒采样。提出了基于级联二次谐波和差频产生的皮秒光开关，并进行了实验验证。较少

Theoretical analysis and experimental work were performed on the efficient conversion and control of optical-wave states by waveguide nonlinear-optic devices. The obtained results are summarized as follows.1 Elementary techniques for fabrication of waveguide nonlinear-optic devices were established and improved. For fabrication of ferroelectric domain-inverted gratings for quasi-phase matching, various methods were developed using corrugation electrodes, liquid electrodes and Si stamper electrodes. Important insights were obtained also on waveguide fabrication by newly-developed vapor-phase proton exchange and Zn indiffusion.2 Optical second-harmonic generation devices, sum-frequency generation devices and difference-frequency generation devices for various wavelength regions were actually designed, fabricated and evaluated. Application of difference-frequency generation devices as wavelength conversion devices for optical communications were discussed and experimentally demonstrated.3 … More Systematic theoretical analyses were performed on the conversion and control of quantum states of optical waves in various nonlinear-optic devices, and characteristics of optical-wave state conversion and control such as generation and wavelength conversion of squeezed states were clarified. Quantum noise measurements were performed using the fabricated device, low-noise external cavity tunable semiconductor laser as a pumping light source and balanced detectors, and preliminary results were obtained toward squeezed light generation by waveguide second-harmonic generation devices.4 Theoretical and experimental work was performed on ultra-fast optical control by waveguide nonlinear-optic devices. High-speed optical sampling using quasi-phase-matched sum-frequency generation device was proposed. Efficient picosecond sampling was demonstrated using the designed and fabricated devices. Picosecond optical switching based on cascading second-harmonic generation and difference-frequency generation was also proposed and experimentally demonstrated. Less