The Preparation And Property Investigation Of Fluorophosphate Glass-ceramic Composite Materials With High Transmittance And Long Life Time

High power laser has become a hot research with the rapid development of laser technology. The traditional laser materials are not fit the contemporary high power lasers from the current point of view. The glass or crystal laser material has their vital shortcoming to restrict the development of the high power laser. The high power laser needs high optical gain and large size. In order to improve the present situation, the transparent glass ceramic meets the requirement of high gain and large size, which provides a new material for high power laser. In this thesis, we prepared Nd³⁺ doped the transparent glass ceramics by the method of thermal treatment and two-step melt-quenching.The research contents are as follows:1, The design optimization of the classical fluorophosphate glass is carried out.We prepared a series of fluorophosphate glasses doped with different Nd content from 1 wt% to 5 wt%. It is to optimize the rare earth ions content. It is found that 1wt% Nd2O3 doped fluorophosphate glass has longer fluorescence lifetime and larger emission cross section, which is τ=629 μs and sem=4.72×10-20cm-2, respectively. 2, Nd³⁺:SrAlF₅ nanocrystals embedded fluorophosphate glass-ceramics are prepared by the melt-quenching and subsequent thermal treatment method. The temperture of thermal treatment method is 500℃、510℃、520℃.The formation of Sr Al F5 nanocrystals in the glass is confirmed by X-ray diffraction（XRD）,scanning electron microscope（SEM） and transmission electron microscope（TEM）.The fluorescence intensity and lifetime of the glass-ceramics increased with the increase of size of nanocrystals. Importantly, by controlling growth of nanocrystals, an obvious enhancement of lifetime（756 μs） emerged in the glass-ceramics heat-treated at 510 °C and the transmittance can reach to72.2% at 1049 nm. 3, We prepared fluorophosphate glass embedded with SrF₂:Nd nanocrystals by the method of two-step melt-quenching. The content of nanocrystals was 20wt%. The prepared sample exhibited high transmittance, and the fluorescence of Nd³⁺ was longer than 561 μs.