| Study on Preparation, Spectroscopy and Lasing Properties of Inorganic-based Hybrid Solid State Dye Laser Medium and the PrototypeInstrumentAbstractOrganic-inorganic hybrid solid-state optical materials and the related instruments is a new research field in materials and information science. Solid-state tunable dye laser has wide range of applications in many areas such as science, medicine, information and military for its advantages including high laser output energy, broad tunable range, good beam quality and reliability, and miniaturization and has been studied intensively in recent years. The preparation of organic-inorganic hybrid solid-state dye laser materials, research on the fluorescence and lasing properties of these materials and their prototype instruments are included in this paper.This thesis systematically reviewed, summarized and commented on the latest research progress, key technological and scientific problems and development of solid-state dye laser medium and the optimized instrument.The comparison of hydrolysis-polycondensation reaction and microstructure of ORMOSILs derived by TEOS, MTES, VTES, ETES confirms that the influence of organic group such as methyl, vinyl, ethyl and ethoxyl on the hydrolysis and polycondensation reaction rate depends on several factors including electron-donating capability, size and number of ethoxyl group which can participates polycondensation reaction. The hydrolysis reaction rate decreases in the sequence of MTES>TEOS>VTES >ETES. The polycondensation reaction rates of MTES, VTES, and ETES are slower compared with that of TEOS, resulted from the reduced number of organic groups, which can participate polycondensation reaction. So, it is impossible to obtain a homogeneous, crack-free, large size ORMOSIL monolith through the typical method of acid catalyzed one-step sol-gel process.Based on the research of the hydrolysis and polycondensation reactionVIAbstractcharacteristics and their mechanisms, a patented 2 steps synthesis technique is developed. By precisely control the catalyst condition step by step, the kinetics processes of the hydrolysis and polycondensation reactions can be effectively adjusted, resulting in microstructure controllable, dense, optical homogeneous and large size solid monolith. By this technique, solid-state dye laser materials with high transmittance in UV-VIS region (>80%), high laser efficiency (57.8-78.8%), long laser lifetime (>105 shots) and high laser damage threshold (4.3-4.5J/cm2) are successfully synthesized.The laser performance of p567, p-orange, p-red and C440 doped in various solid hosts are investigated and the solid-state dye laser output from blue to red light region are demonstrated. 466.7GJ/mol of normalizedphotostability of p-red is obtained at pump intensity as high as 1 .4J/cm . The large differences in laser performance of p567 and p-orange doped in various solid hosts confirms the influence of micro chemical environment of the dye molecules on laser properties.The research of the photodegradation mechanism of laser dye p567 doped in solid-state dye laser medium confirms that the addition of DABCO and TMP can greatly improve the photostability of laser dye and the optimized concentration of each additives are determined, i.e. 1.5 .10-3 mol/1 and 4.10"4 mol/1, respectively. At appropriate additive concentration, the photostability of p567 is improved by at least 100% and the fluorescence intensity of p567 kept constant at initial value after 200 hours of UV irradiation. The improvement in photostability can be attributed to the quenching effect of DABCO and TMP on singlet state oxygen thereby resulted in the reduction of photochemical reaction of p567. The main mechanism of the photodegradation of p567 laser dye can be catalogued as self-sensitized photo-oxidation and radical-sensitized photo-oxidation.Based on the results of spectra measurement and theoretical calculations, the interaction and energy transfer mechanism of different kinds of dyes co-doped in ORMOSILs are investigated. This rese...
|
PDF Full Text Request