Determination of threshold random gain medium in dye: Polymer films containing TiO<sub>2</sub>nanoparticles
Determination of threshold random gain medium in dye: Polymer films containing TiO<sub>2</sub>nanoparticles作者机构：Department of Physics College of Science University of Baghdad Baghdad Iraq Ministry of Environment Baghdad Iraq
出 版 物：《Natural Science》 (自然科学期刊（英文）)
年 卷 期：2012年第4卷第6期
页 面：402-408页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Random Gain Medium Random Laser Internal Resonator
摘 要：Random gain medium based on organic Rhodamine 590 (R590) laser-dye and Titanium dioxide (TiO2) suspended nanoparticles have been prepared with polymethylmethacrylate (PMMA) as a host. Spray-coated homogeneous film samples of 22.4 μm thickness. Optimum concentrations have been determined depending on the normal fluorescence spectra which give evidence that the laser dye provides amplification and TiO2 nanoparticles act as scatter center. At the optimum concentrations, results of the random gain medium under second harmonic Nd: YAG laser excitation shows that the values of bandwidth at full width half-maximum (FWHM) and the threshold energy are about 11 nm and 10 mJ respectively.
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