| Mid-infrared(mid-IR) radiation has an impo rtant value in the science and technology application, which has aroused people’s great interest, and widespread application in the information technology, industrial process control, photochemistry, photobiology, photomedicine, military and so on. Mid-IR spectrum generally refers to the electromagnetic wavelengt hs which are longer than 2 μm, and covers several important atmospheric window(1-3 μm, 3-5 μm, 8-14 μm), and it is the absorption fingerprint region of many materials. So in a timely manner to promote the de velop ment of coherent mid-IR sources is crutial, especially in the future of a wide range of science, technology and industry. At present, we mainly choose the fluoride material in the research of mid-IR spectral region due to its high lumino us efficiency, b ut it existssome serious problems, such as extreme preparation process, and poor stability of physical chemistry aspects. The physical and chemical stability of oxide matrix are high but the phonon energy is relatively high. Therefore, selecting the appr opr iate substrate material is the impor tant factor to improvethe mid-IR radiation. Previous research on oxide matrix is mainly concentrated in a single component matrix material, and this paper carried out the complex oxide matrix doped with rare-earth Ho3+, Tm3+, Er3+ and Yb3+ ions. This paper studies the physical and chemical properties of the matrix, the optical properties of rare earth ions in the matrix, the optical transition nature, the infrared emission spectrum, and the up-conversion characteristics such as aims to lay the foundation for the development of the mid-IR device. This dissertation is divided into six main chapters:In chapter 1, we mainly summarize the research progress of the infrared laser fluorescence material and the rare earth doped fiber amplifier materials, and introd uce the characteristics of several types of glass substrate material.In chapter 2, we mainly introducethe basic theory of the rare earth ion luminescence, including rare earth ion spectrum energy level structure, energy transfer, Judd O felt theory, absorb emission cross section, the gain ba ndw idt h, Rietveld refinement method, etc. In chapter 3, we mainly introduce thepreparation process of rare earth ions doped tellurite glass, experimental testing method, and all kinds of instruments and equipment, and analyze the DTA curveof samples. Its physical and chemical properties were analyzed. In chapter 4 and 5, we mainly study the spectral performance of Yb3+/Ho3+ and Yb3+/Tm3+ co-doped tellurium phosphate glass. According to Judd-O felt theory, we calculatethe spectral parameters of the rare earth ions Ho3+ and Tm3+ in tellurium phosphate. According to the Mc C umber theory, we calculate the emission cross section, further calculate the gain coefficient and bandwidth, and test the corresponding infrared emission spectrum of the samples. The results show that the change of its components has great influence to the physical and luminescence properties.In chapter 6, we mainly study the luminescence properties of the Ba Gd2 Zn O5 oxide substrates doped with rare earth ions Er3+, Tm3+, Yb3+. The preparation process is introduced. The Ba Gd2 Zn O5 crystal structure is analyzed using the Rietveld refine ment method. Its reflection spectrum, gap, phonon energy, infrared spectrum, up-conversion characteristics are studied.The results show that the system has excellent characteristics and great app lication potential. |
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