title: Laser Performance of Some Oxazole Laser Dyes in Restricted Matrices.
abstract: This article reports the optical properties such as absorption profile, molar absorptivity, fluorescence profile and photo-physical parameters such as dipole moment, oscillator strength, fluorescence quantum yields, fluorescence lifetimes, laser performance and finally photostability of 2,5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene (BBOT),1,4-Bis(5-phenyl-2-oxazolyl)benzene (POPOB), 5-diphenyel-oxazole (PPO) laser dyes in different restricted hosts. (BBOT), (POPOB) and (PPO) are embedded in transparent silica-based nanoporous sol-gel glass and copolymer matrix of methyl methacrylate (MMA) and 2-hydroxyethyl methacrylate (HEMA). The absorption and fluorescence properties of these laser dyes in sol-gel glass matrices are compared with their respective properties in copolymer host. In case of sol-gel matrix, all dyes had higher quantum yields as well as lasing wavelength maxima. The laser performances as well as the photostability of these laser dyes in sol-gel glass displayed senior behavior compared with (MMA/ HEMA) copolymer samples upon using nitrogen laser (337.1 nm) as pumping energy.
authors.affiliation: Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt.|Misr University for Science and Technology (MUST), 6th of October City, Egypt.
authors.forename: Mahmoud A S
authors.initials: MAS
authors.lastname: Sakr
authors.affiliation: Misr University for Science and Technology (MUST), 6th of October City, Egypt.
authors.forename: Sayed A
authors.initials: SA
authors.lastname: Abdel Gawad
authors.affiliation: Laser science and interactions department, National Institute of Laser Enhanced Science (NILES), Cairo University, P.O. Box 12613, Giza, Egypt. mabou202@hotmail.com.
authors.forename: Maram T H
authors.initials: MTH
authors.lastname: Abou Kana
authors.affiliation: Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt. drzeiny@yahoo.com.|Misr University for Science and Technology (MUST), 6th of October City, Egypt. drzeiny@yahoo.com.
authors.forename: El-Zeiny M
authors.initials: EM
authors.lastname: Ebeid
keywords: Copolymer matrix; Laser performance and photostability; Oxazole laser dyes; Photo-physical parameters; Restricted media; Silica based sol-gel matrix