【作者】 韩俊鹤；

【导师】 余保龙； 莫育俊；

【作者基本信息】 河南大学 ， 光学， 2002， 硕士

【摘要】 1989年Mansoor Sheik-Bahae等人提出了单光束2扫描技术，由于该方法具有实验装置简单、结果易于分析、灵敏度高等优点，因此该方法一经提出便受到广泛关注。现在Z扫描技术已经发展成为测量非线性光学特性的一种重要手段。 我们对该方法及其原理进行了简单介绍，并在该原理的基础上建立了一套自动Z扫描测试系统。该系统主要包括Z扫描控制及数据采集软件、多功能数据采集卡、电动导轨和功率能量系统。其中，Z扫描控制及数据采集软件是在Windows98操作系统下，利用LabWindows/CVI开发出来的，利用该软件进行双通道扫描可以很方便的消除由于功率波动引起的实验误差；多功能数据采集卡是我们自行开发的，它可以同时控制电动导轨和进行数据采集；电动导轨是由光学精密导轨和步进电机等组装成的；功率能量系统采用的是Molectron Detector Inc．的EPM2000。 我们用溶胶-凝胶法制备了掺杂八异戊氧基钯酞菁玻璃，并利用自动Z扫描测试系统对该样品的三阶非线性光学特性进行了研究，结果表明该材料具有大的三阶非线性系数。此外，我们还对掺八异戊氧基钯酞菁玻璃自相互作用过程、光限幅特性和损伤阈值等光学特性进行了研究。并分析了在脉冲激光和连续激光作用下，引起酞菁玻璃非线性折射率改变的不同物理机制。研究结果表明钯酞菁在可见光波段具有较好的光限幅特性和较大的损伤阈值，因此该材料可以作为可见光区的光限幅器。我们认为自衍射是影响光限幅特性的主要因素，而由于吸收引起的热效应是影响损伤阈值的主要因素。更多还原

【Abstract】 Mansoor Sheik Bahae introduced a high sensitive single-beam Z-scan technique in 1989. It requires relatively simple experimental apparatus and simple analysis. Z-scan technique has been widely employed since it is reported. Now, it has become an important method used in studying the nonlinear optical characteristics .We describe the single-beam Z-scan method and how it can be deduced. The setup of automatic Z-scan system is established under this theory. It consists of four: parts: the program of automatic Z-scan control and data processing, multi-function data acquisition and control board, motorized translation stage, and joulemeter/ -powermeter. Based on the Windows98 system, the program of automatic Z-scan control and data processing is programmed in LabWindows/CVI environment. The experiment error can be eliminated by Automatic Z-scan system through dual channel scan. The multi-function data acquisition and control board, motorized translation stage are made in our lab. The joulemeter/powermeter is EPM2000 of Molectron Detector Inc..The palladium-octaisopentyloxy-phthalocyanine-doped ormosil glass (octa -PdPc glass) is prepared by the sol-gel method. The nonlinear coefficient of Octa-PdPc glass is measured by single-beam Z-scan method’. The result with automatic Z-scan system is more accurate than the manual measurement. In addition, self-interacting and optical limiting properties of octa-PdPc glass under the illumination of CW laser beam is also measured. Optical limiting properties and damage critical power at different wavelengths were investigated. Due to its largeoptical limiting effect and high critical power, this material could have potentialapplications in constructing optical limiters. The result shows that the optical limitingproperties and damage critical power were determined by self-diffraction and lightabsorption respectively.更多还原