Study of Integrated-Optic Taper Pickup Device

[1]用于光束聚焦的锥形波导器理论上研究了锥形波导束的聚焦特性。结果表明，输出光束在距端面60微米处聚焦，光斑尺寸为3微米。研究了由电光效应引起的焦距控制。[2]梯度折射率光波导中的光束控制用钛内扩散形成的梯度折射率光波导演示了光导波的聚焦。用波动光学方法找到了最佳折射率分布。讨论了利用空间滤波和多光束传输特性恢复退化光束的方法。[3]磁光器件研究了采用磁光模式转换的波导型单段光隔离器，阐明了隔离器和环行器的基本特性。利用静磁表面波实现了高速光开关，并讨论了一种有效的多层结构器件。[4]在LiNbO_3衬底上制作了共线声光器件，实现了声光器件波长选择开关和偏转。用有限元和边界元方法对光盘凹坑的光散射特性进行了理论分析。

[1] Tapered waveguide device for bean focusingOptical beam focusing characteristics from tapered waveguides were theoretically investigated. It was found that the output beam was focused at a distance 60mum from the end facet with the spot size of 3. lmum. The control of the focal length due to electro-optic effect was also studied.[2] Beam control in graded-index waveguideFocusing of optical guided waves was demonstrated with a graded-index waveguide formed by Ti indiffusion. An optimum index distribution was found using wave optics. Restoration of degraded optical beams by means of spatial filtering and propagation characteristics of multiple beams were discussed.[3] Magneto-optic devicesWaveguide-type monosectional optical isolators using magneto-optic mode-conversion were studied and fundamental properties for isolators and circulators were clarified. High-speed optical switching by magnetostatic surface waves was demonstrated and an efficient device with multilayer structure was discussed.[4] Switching and deflection using acousto-optic devicesWavelength-selective switching was demonstrated with collinear acousto-optic devices fabricated on a LiNbO3 substrate. Deflection of multiple optical beams due to Bragg diffraction by SAW was also investigated.[5] Scattering from pitsOptical scattering characteristics from pits of optical disks were theoretically analyzed using finite element and boundary element methods.