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Development of new Yb-doped laser glass

Author: JiaMing
Tutor: LuAnXian
School: Central South University
Course: Materials Science
Keywords: Boron phosphate glass Absorption cross section Emission cross section Fluorescence lifetime Thermo-mechanical properties
CLC: TQ171
Type: Master's thesis
Year: 2004
Downloads: 219
Quote: 3
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Abstract


Study the doped Yb 3 : the phosphates and Yb-doped 3 : boron phosphate two glass-forming region, crystallization performance, absorption spectra, fluorescence spectra and fluorescence lifetime characteristics , and the structure and properties of boron phosphate glass, a more detailed analysis and research aimed at finding a suitable matrix glass-doped Yb 3 , in order to end up with high emission cross section, long fluorescence lifetime excellent physical and chemical properties for practical ytterbium-doped laser glass. Prepared doped Nd 3 laser glass, comparison and analysis of the system and Yb-doped 3 laser glass, draw some meaningful conclusions. The thesis is divided into an introduction, literature review, theoretical basis, experimental methods, results and discussion and conclusions of the six parts. The paper outlines the background of the development of laser glass, developments and theoretical basis, and following major progress and results achieved through a comprehensive and systematic experimental study: 1. Integral absorption cross section of the laser glass, the emission cross section and the fluorescence lifetime is the characterization of the laser glass gain coefficient, and excited state minimum number of particles the important parameters of the saturation pump intensity, the intensity of these parameters with the oxide glass covalent bond, and rare earth ions surrounding non symmetry have a great relationship. Silicate laser glass and phosphate laser glass spectral nature of the differences are mainly due to the two different network structure, a special chain structure of the phosphate glass so that the rare earth ions around the non-symmetry of the larger, thus making its stimulated emission sectional relatively silicate glass is also relatively large. 2. The laser glass we prepared public international and domestic commercial laser glass compared to the fluorescence lifetime is slightly shorter, but the emission cross section of a larger, making both the product of the gain coefficient than the average large. 3. Initially explored the boron phosphate glass into a glass range, successfully prepared containing both borate and phosphate glass composite generating body, and the infrared and Raman spectra show that its structure and phosphate and borate significant difference . 4. In previous studies of laser glass, a material with poor thermal shock resistance, and the preparation of boron phosphate laser glass, thermal properties and mechanical properties than the previously prepared a single generation glass of superior. The same time, the by appropriate adjustments ingredients, effectively inhibit the impact of the the boron introduction of the fluorescence lifetime of the laser glass, prepared doped Nd 3 and Yb-doped 3 boron phosphate laser glass fluorescent life expectancy for 260μs and 1000μs these performance comparable with phosphate glass, is expected to become a new laser materials.

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