Properties investigation of Yb3+doped phosphate glasses for fiber laser application

• Main Authors: Chun-Hsiung Lin, 林群雄
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/00417269208875933042

碩士 === 國立聯合大學 === 材料科學工程學系碩士班 === 97 === The physical and optical properties of P2O5-Al2O3-ZnO glasses doped with different concentration of Yb3+ ions are investigated. In addition, fiber drawing of glasses are proceeded by using the double crucible method. The relation between of drawing temperature, drawing time and the drawing speed on quality of fiber were discussed. The experimental results indicated that density, chemical durability, glass transition temperature (Tg) and glass softening temperature (Td) of glasses will be increased when the Yb2O3 added to glasses. However, the coefficient of thermal expansion (α) for glasses will be decreased. From the results of Fourier transform infrared spectroscopy, adding Yb2O3 to the glasses results in that the numbers of (-P-O-P-) bonds will be decreased and (-P-O-M+-) bonds will be increased. According to the foregoing results, the refractive index of glasses will be raised. Moreover, the results of absorption spectra indicated that the absorption peak of glasses are observed at both wavelengths of 916nm and 977nm. As increasing the concentration of Yb2O3, the absorption efficiencies will become stronger. In accordance with the results of fluorescence spectra, the fluorescence emission of glasses are detected at wavelengths of 970nm, 995nm, 1020nm and 1048nm, respectively. The intensity of the fluorescence emission peaks will significantly decrease at wavelengths of 970nm and 995nm as the concentration of Yb2O3 increases. However, intensity of the fluorescence emission peaks will significantly increase at wavelength of 1048nm under the same condition. The results of fiber drawing indicated that the decrement of the drawing temperature and the increment of the drawing time and the drawing speed will result in the decrement of the diameter of fiber.