Upconversion Luminescence Of Rare Earth Doped Glass Induced By Femtosecond Laser

Three-dimensional display technology has wide applications in museums, exhibition halls and family recreation areas, and especially have broad application prospects in medical, defense, military and aerospace fields. From the 1980s of the 20th century, governments, companies and research organizations have begun to focus on three-dimensional display. Japan and the EU are implementing the national plan to develop this technology. And the solid-state three-dimensional volumetric display receives more and more attentions from 1990s of the 20th century.This thesis introduces the multiphoton absorption theory, the application of femtosecond laser, and especially gives an overview of the recent progress and existed problems on three-dimensional display technology. We studied the rare earth doped glass and glass-ceramics which can be used for three-dimensional display.We have measured the absorption spectra, photoluminescence spectra and excitation spectra of Tb³⁺ and Eu³⁺doped-ZnO-B₂O₃-SiO₂ glass and the fluorescence spectra excited by 800nm femtosecond laser. The upconversion luminescence process of Tb³⁺ -doped glass is a three photon simultaneous absorption process and Eu³⁺-doped glass is a two photon simultaneous absorption process from the relationship between the fluorescence intensity and the pumping power, and the absorption spectra. The value of the three-photon absorption coefficient Tb³⁺-doped glass is about 8.24×10^-24cm³w^-2 and the three-photon absorption cross section is about 1.832×10^-81cm⁶s². The value of the two-photon absorption coefficient Eu³⁺-doped glass is about 4.25×10^-8cm/w and the two-photon absorption cross section is about 3.92×10^-47cm⁴w^-1s.We also demonstrated the three dimension display based on multiphoton upconversion luminescence.We have measured the absorption spectra, photoluminescence spectra and excitation spectra of Tm³⁺ doped-SiO_-Al₂O₃ -Na₂O-BaF₂-La₂O₃ glass and glass ceramics and the fluorescence spectra excited by 800nm femtosecond laser. Compared to Tm³⁺ doped glass, the emission intensity of Tm³⁺ doped glass ceramics is greatly enhanced whenexcited by femtosecond laser. We also demonstrated the three dimension display based on the multiphoton upconversion luminescence.