Davelopment of Nonlinear Optical Frequency-Conversion Micro Devices Using Micro-Fabrication Technique for Organic Crystals

1.器件设计我们从理论上分析了许多频率转换器件，并建立了高效器件的指导方针。我们已经证明，为了充分利用有机分子和晶体的高光学非线性，我们必须在变频器件中使用准相位匹配方案。器件制造技术一种新的有机晶体微结构的制造方法得到了发展。这包括使用无机光刻胶HPA和O_2-RIBE技术。这项新技术使制造有机晶体波导结构成为可能。新器件的提出我们提出了一种新的基于准相位匹配的高效腔增强基波SHG器件。我们还提出了基于模拟退火优化的非周期光栅的准相位匹配SHG器件。结果表明，该方法可以同时获得较高的效率和较大的相位匹配公差。这两种器件架构将适用于由有机晶体制成的高性能SHG器件。基于上述研究成果，新型有机晶体波导SHG器件的制备工作正在进行中。

1.Device DesignWe have theoretically analyzed a number of frequency-conversion devices, and established a guideline toward highly efficient devices.We have shown that we have to use quasi-phase-matching scheme in frequencyconversion devices in order to fully utilize high optical nonlinearities of organic molecules and crystals.2.Device Fabrication TechnologyA new fabrication method of micro structures of organic crystals has been developed.This consists of the use of an inorganic photoresist HPA and O_2-RIBE technique.This new technology makes it possible to fabricate organic-crystalline waveguiding structures.3.Proposal of New DevicesWe have proposed a new efficient SHG device based on quasi-phase-matching for cavity-enhanced fundamental wave. We have also proposed quasi-phase-matching SHG device based on aperiodic gratings optimized by simulated annealing.By using this technique, we have shown that we can obtain high efficiency as well as large phase-matching tolerance simultaneously.These two device architectures will be suitable for high performance SHG devices made of organic crystals.Based on the research results, fabrication of new organic crystalline waveguiding SHG devices is now underway.