The Preparation And Characteristics Analysis Of Yb³⁺-Doped Silicate Laser Glasses

In recent years, along with the development of solid-state laser,people are paying high attention to the research of laser material. Because of the excellent thermodynamic and optical properties and advantage of high doping concentration, Yb³⁺-doped laser glass is regard as the important material applied in high energy and high power laser application. In this paper, The Yb³⁺-doped silicate glass is prepared by using no-CVD high temperature melting process. Through testing the physical properties of glass and analyzing the absorption and fluorescence spectra of glass, the laser characteristics which laser materials presented is researched. The integrated absorption cross section, stimulated emission cross section and fluorescence lifetime of Yb³⁺ are calculated theoretically. The comprehensive test of the experiments show that the laser material prepared could meet the application requirements of laser glass. The main contents of this dissertation are summarized as follows:Firstly, the research advances of rare-earth doped fiber lasers and the basic requirements and the application of laser glass is introduced, and the basic theory of Yb³⁺-doped laser glass is discussed in detail.Secondly, this paper elaboratesd the design of the matrix material of Yb³⁺-doped laser glass, including the choice of the glass system, the role of glass composition and the design requirements of laser glass formula. Through high temperature melting process, the laser glass sample is prepared, and the comparative analysis of the different melting process is made.Lastly, the physical characteristic and spectral characteristic of the laser glass sample which is prepared is tested and analyzed. Combining the spectral theory of rare-earth ions and the computation method of laser parameter, the absorption cross-sectionσ_abs, the stimulated emission cross-sectionσ_p, the flurescence lifetimeÏ„_f, the least particles countβ, the saturation pump intensity I_sat and the least pump intensity I_min of the samples are obtained. Out of consideration for practicability, the resistant to laser intensity of material sample is testing, so as to test whether it meets the requirement of the high power fiber laser.