The Study of Laser-Induced Holographic Grating Relaxation in Azo Dye-Doped Liquid Crystal Samples

• Main Authors: Che-Chuan Tu, 杜哲全
• Other Authors: Chie-Tong Kuo
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/76877036929798109370

碩士 === 國立中山大學 === 物理學系研究所 === 90 === In this study, a high power Q-switch pulse laser has been used as the writing beams. The laser-induced holographic gratings in the DR1-doped liquid crystal samples and the DR1-PMMA polymer thin films were investigated by changing the temperature of samples and the angles of two writing beams. The He-Ne cw laser has been used as a real-time probe beam to detect the first order diffraction signals. Without external field, the gratings are the results of concentrations and diffusions of azo dye isomers. The diffusion model has been utilized to analyze the first order diffraction signals in order to understand the mechanics of gratings and the effect of temperature and angle.