Development of Highly Efficient, Visible Coherent Light Sources Using Semiconductor Lasers and Organic Nomlinear Optical Materials

短波长的紧凑型相干光源在显示器等许多光电子学应用中是非常需要的。记录和图像处理。以有机材料为活性介质，以半导体激光器为光源的光学二次谐波产生似乎是一种特别有吸引力的方法，因为一些有机材料具有非常大的二阶光学非线性。这项研究的目的是探索新材料，开发实现高效的基础技术。由有机材料和半导体激光器组成的波导型倍频器件。用CNDO/S方法对一些有机分子和晶体的分子极化率和二阶极化率进行了理论计算。与现有的实验数据一致地获得了相当好的一致性。提出了一种测量光学单线性度的改进的Maker条纹法；采用低功率(单模或多模)连续半导体激光器作为光源，并与光电倍增管探测系统相结合。发现了由于输入辐射的单模特性而产生的新效应。对MNA、DAN和MBANP晶体的线性和非线性光学性质进行了表征。这些材料被认为是很有前途的倍频器件材料。从MNA晶体的斜波导中观察到了切伦科夫辐射形式的有效倍频。已开发出控制板坯构型中结晶取向的方法。

compact coherent light sources emitting at short wavelengths are badly needed in many optoelectronic applications such as displays. recording and image processing. Optical second harmonic generation (SHG) using organic materials as active media and semiconductor lasers as light sources seems-to oe a particularly attractive approach because some organic materials are known to exhibit remarkably large second-order optical nonlinearities. This research has been conducted to explore new materials and develop basic technologies for realizing efficient. waveguide-type SHG devices comprising organic materials and semiconductor lasers.1. Molecular nvperpolarizabilities and second-order susceptibilities have been theoretically calculated for a number of organic molecules and crystals using a CNDO/S method. Reasonably good agrement with existing experimental data have consistently been obtained.2. A modified Maker-fringe method has been developed for measuring optical monlinearities; low power (single- or multi-mode) cw semiconductor lasers are used as light sources in combination with a photomultipliar detection system. New effects arising from single-mode nature of the input radiation have been discovered.3. Linear and nonlinear optical properties have been characterized for MNA, DAN and MBANP crystals. These have been found to be promising materials for SHG devices.4. Efficient SHG in the form of Cerenkov rediation has been observed form a slad waveguide of MNA crystal. Methods have been developed for controlling crytal orientaion in the slab configuration.