Bi-doped silicate glass, ultra-broadband near-infrared luminescence properties and mechanism of

Title: Bi-doped silicate glass, ultra-broadband near-infrared luminescence properties and mechanism ofAuthor: Liu ZhiliangDegree-granting unit: Kunming University of ScienceKeywords: glass structure;; ultra-wideband;; bismuth;; near-infrared light;; silicate glassSummary:

To achieve large-capacity information transmission, ultra-fast real-time information processing and ultra-high density information storage in the rare earth magnets information age to achieve these three objectives. Information carriers to photons instead of electrons photoelectron or the future development trend of information technology.

The 1980s, erbium-doped fiber amplifiers (Erbium Doped Fiber Amplifiers, EDFA) is widely used in the invention of long-distance optical communication, the wavelength division multiplexing (Wavelength Division Multiplexing, WDM) technology to become a reality, greatly promoted the development of communication technology . However, due to electronic transitions of rare earth ion inner constraints, the gain bandwidth is difficult to over 100 nm, which limits the transmission capacity of optical fiber communication. With the rapid development of optical communication technology, which can provide the gain spectrum can not meet the actual needs.

In 2001, Fujimoto observed in bismuth-doped glass to cover the entire low-loss ultra-wideband communications window near-infrared light, the discovery of bismuth-doped glass to make people attracted wide interest. Bismuth-doped glass has wide bandwidth, and long fluorescence lifetime, once the Bi-doped glass for optical amplifier with a matrix material, can be achieved using only a single fiber low-loss optical communication window of the optical signal amplification. However, the broadband light for bismuth mechanism is not clear, while bismuth ion doped glass itself has some problems to overcome, and therefore need the glass matrix of bismuth ions from the broadband luminescence of departure to explore the mechanism of bismuth ions broadband light, to select more excellent matrix material, bismuth ions to solve the problems faced by broadband light, and thus achieve more excellent performance of broadband light. .

This Bi-doped aluminosilicate glass selected for the study, examined the structural changes in the glass matrix luminescence properties of bismuth impact of broadband. On the one hand, the silicate glass system, we found that the glass network structure Al2O3 concentration is changed, bismuth luminescence intensity of ultra-broadband infrared, fluorescence and fluorescence lifetime and so the bandwidth will be changed. On the other hand, in previous work by our group on the basis of the network modified by changing the glass body, found that changes in the radius of alkaline earth metal ions on the influence of the infrared light intensity. We have glass micro-structural changes on bismuth broadband light-emitting mechanism of the analysis, the presence of glass in different valence states of bismuth ions form the luminescence centers, laser irradiation at different wavelengths obtained under different wavelengths of near-infrared broadband light. The results of the Bi ions ultra-wideband http://www.chinamagnets.biz/ optical amplification device materials research provides a theoretical support.

This paper describes in the introduction, the development of optical fiber communication, optical fiber amplifier types and the basic principles and current applications of several rare-earth fiber amplifiers and Raman fiber amplifiers; second describes the study of bismuth-doped glass, the status quo, that the the existence of scientific problems; Finally bismuth-doped glass infrared optical amplification status of materials research, and this paper describes the infrared light-emitting properties of bismuth-doped glass the purpose and significance.

In the second experimental part of the chapter, the main purpose of the study describes the experimental and research methods, experimental research methods include: the purity of drugs used in the experiment, sample preparation methods, optical characterization, etc.

Chapter III of the Al203 concentration on SiO2-Al2O3-CaO and optical properties of the modified precursor ion radius of the network changes in SiO2-Al2O3-RO system of light-emitting properties of the glass. The study found that in the 808 nm diode laser excitation, in the Bi-doped aluminosilicate glass systems are found in fluorescent center is located in 1.3μm, half-height bandwidths exceeding 200 nm, fluorescence lifetime than 500μs ultra-wideband near-infrared light, cover almost the entire low-loss optical communication window. As the body of the glass matrix modifier ionic radius of the network increases, the 808 nm laser excitation, the near-infrared light intensity increased, which made our group contrary to the theory of optical basicity. As a result, we believe that the theory can not fully explain the optical basicity of bismuth-doped silicate glass near-infrared luminescence. Glass composition changes resulting microstructure may affect the near-infrared luminescence properties of bismuth ion is an important factor.

Inferences made by the third chapter, chapter 4 from the glass matrix microstructure on the infrared luminescence of Bi ions the perspective of the ultra-broadband luminescence of bismuth factors that affect change. Experiments were prepared by different Si02 content of aluminum ion concentration of the silicate glass system, the network formed by http://www.chinamagnets.biz/ changing the body composition of glass to change the microstructure of silicate glass, and then test its spectral properties, comparison and analysis, the bismuth broadband light with glass matrix microstructure changes in the law.

Chapter V summarizes the experimental results, problems and future research directions.Degree Year: 2010