Engineering Research Equipment: Pulsed Laser System for Dynamical Studies of Photonic Materials

9500106 Ducharme内布拉斯加州大学物理和天文学系将为我们购买一台脉冲激光系统，并进行几个研究项目。所提出的脉冲激光系统包括：1)商用调Q泵浦和二次谐波产生器；2)定制窄带宽脉冲染料激光器；3)适用于高功率激光器的光学台、探测器和光学元件。脉冲激光系统将被用来在比我们的连续波激光器(等于或大于1ms)更短的时间尺度(等于或大于5 ns)上进行动态测量，从而扩展了几个研究项目的范围。这些项目包括：1)光折变聚合物的动力学研究，阐明了电荷的产生、陷阱和输运过程；2)热释电材料中热释电和电光复合响应在亚微秒级引起的全光调制，在此期间热释电效应占主导地位；3)光折变非线性法布里-珀罗标准具的动态响应，表现出强度相关的非对称传输和光学双稳；4)光折变材料中调制吸收的光谱和动力学，以获得关于(“深”和“浅”)陷阱的能量、寿命、截面和其他信息；以及5)聚合物/晶体纳米复合材料的非线性光学效应。***

9500106 Ducharme The Department of Physics and Astronomy at the University of Nebraska will purchase a pulsed laser system for us with several research projects. The proposed pulsed laser system consists of: 1) a commercial Q-switched Nd:YAG pump laser and second harmonic generator, 2) a custom narrow bandwidth pulsed dye laser, and 3) an optical table, detectors, and optical elements suitable for use with high power lasers. The pulsed laser system will be used to conduct dynamical measurements on a much shorter time scale (equal to or greater than 5 ns) than is possible with our CW lasers (equal to or greater that 1 ms), extending the scope of several research projects. These projects include: 1) Dynamical studies of photorefractive polymers elucidating charge generation, trapping, and transport processes, 2) All-optical modulation caused by combined pyroelectric and electro-optic response in pyroelectric materials in the sub- microsecond time scale during which the pyroelectric effects are dominant, 3) Dynamical response of the photorefractive nonlinear Fabry-Perot etalon which exhibits intensity dependent asymmetric transmission and may exhibit optical bistability, 4) Spectroscopy and dynamics of modulated absorption in photorefractive materials to obtain energies, lifetimes, cross sections, and other information concerning ("deep" and "shallow") traps, and 5) Nonlinear optical effects on polymer/crystal nanocomposites. ***