2μm波段钡镓锗酸盐玻璃单模光纤的研究

发布时间：2018-05-04 06:53

本文选题：钡镓锗酸盐玻璃 + 单模光纤　；参考：《华南理工大学》2015年硕士论文

【摘要】：2μm波段激光在大气监测、激光雷达、激光医疗和光谱学等领域有着广泛的应用。传统最常用的石英光纤稀土掺杂浓度较低,限制了激光输出性能。近年来,国内外越来越多学者把目光转向稀土溶解度高的多组分玻璃。在多组分玻璃中,钡镓锗酸盐玻璃兼具了优异的光学性质和良好的物化和机械性能,是2?m波段光纤激光器理想的基质材料。然而,目前大多数研究仅限于钡镓锗酸盐玻璃中稀土离子光谱性质的分析,还未克服制备高质量钡镓锗玻璃光纤的一些关键性障碍。本文通过探究钡镓锗酸盐玻璃的抗析晶性能、除水工艺以及光纤制备工艺,研制出性能优异的高掺Tm3+钡镓锗玻璃单模光纤。在此基础上,通过全光纤激光实验分析了高掺Tm3+钡镓锗玻璃单模光纤的激光输出性能,具体的研究内容及成果如下:(1)结合玻璃DSC热分析、保温热处理和拉丝实验,探究了玻璃的抗析晶性能。研究表明在钡镓锗玻璃中掺杂少量的La2O3和Y2O3能有效提高玻璃的热稳定性;同时研究发现除水工艺会影响玻璃的抗析晶性能,采用反应气氛法和引入氟化物除水会降低玻璃的抗析晶性能,而鼓入干燥O2除水可以避免除水过程对玻璃抗析晶性能的损害。(2)通过探究鼓入干燥O2除水工艺的通气时间、通气流量和通气温度对除水效率的影响,优化了鼓入干燥O2除水工艺。结果表明优化的除水工艺能有效去除钡镓锗玻璃中的OH-,除水后玻璃的羟基吸收系数为未除水空气中制备玻璃羟基吸收系数的1/10。(3)制备了抗析晶性能优异且羟基含量低的均匀无气泡大块钡镓锗纤芯玻璃,以及与纤芯玻璃物化性能匹配的包层玻璃,纤芯中Tm3+掺杂浓度7.6×1020 ions/cm3。采用管棒法工艺在光纤拉丝塔中拉制了连续无析晶的高掺Tm3+钡镓锗单模光纤,纤芯直径为9.2?m,包层直径为125?m,光纤数值孔径为0.132。(4)采用DBR谐振腔结构,利用自制瓦级1568 nm光纤激光器为泵浦源,在长度为1.6 cm、2.1 cm、2.5 cm的增益光纤上实现了单频激光输出,激光输出波长位于1950.02 nm,激光最大输出功率分别为35 m W、53 m W、73 m W,对应的斜率效率分别为5.5%、8.7%、10.1%。在长度为5 cm和10 cm的增益光纤上实现了多纵模激光输出,激光波长分别位于1949.95 nm和1950.01 nm,激光最大输出功率分别为89 m W和165 m W,斜率效率分别为10.1%和17.0%。
[Abstract]:The 2 渭 m band laser has been widely used in the fields of atmospheric monitoring, lidar, laser medical treatment and spectroscopy. The rare earth doping concentration of quartz fiber is low, which limits the laser output performance. In recent years, more and more scholars at home and abroad have turned their attention to multicomponent glass with high rare earth solubility. Barium gallium germanate glass has excellent optical properties, good physical, chemical and mechanical properties in multicomponent glass. It is an ideal substrate material for 2 m band fiber lasers. However, most of the studies are limited to the analysis of the spectral properties of rare earth ions in barium gallium germanate glasses, and some key obstacles to the preparation of high quality barium gallium-germanium glass fibers have not been overcome. In this paper, the anti-crystallization property of barium gallium germanate glass, the process of water removal and the preparation of optical fiber are investigated, and a high performance barium gallium-germanium glass single mode fiber with excellent properties is developed. On this basis, the laser output properties of high-doped Tm3 barium gallium-germanium glass single mode fiber are analyzed by all-fiber laser experiments. The specific research contents and results are as follows: 1) combined with glass DSC thermal analysis, heat treatment and wire drawing experiments. The crystallization resistance of glass was investigated. The results show that the thermal stability of barium gallium germanium glass can be improved by doping a small amount of La2O3 and Y2O3, and it is found that the process of removing water will affect the crystallization resistance of the glass. By using reaction atmosphere method and adding fluoride to remove water, the anti-crystallization property of glass can be reduced, while the damage of dehydration process to glass crystallization property can be avoided by injecting dry O _ 2 to remove water.) by exploring the aeration time of drying-O _ 2 removing water process, The effect of air flow rate and ventilation temperature on water removal efficiency was studied. The results show that the optimized water removal process can effectively remove OH-from barium gallium germanium glass. The hydroxyl absorption coefficient of glass after removing water is 1 / 10.3 of that of glass prepared in undrained air. Low uniform, bubble free bulk barium gallium germanium core glass, And the cladding glass which matches the physical and chemical properties of the fiber core glass, the doped concentration of Tm3 in the core is 7.6 脳 1020 ionons / cm ~ (3). The single mode fiber with high doped Tm3 barium gallium germanium was fabricated in the fiber wire drawing tower by the tube rod method. The core diameter is 9.2 m, the cladding diameter is 125 nm, and the numerical aperture of fiber is 0.132. 4) the DBR resonator structure is used, the core diameter of the fiber is 9.2 m, the cladding diameter is 125 nm, and the numerical aperture of fiber is 0.132. The single-frequency laser output has been realized on a gain fiber of 1.6 cm ~ (2. 1) cm ~ (2. 1) cm ~ (2. 5) cm by using a 1568 nm fiber laser at the watt level as the pump source. The laser output wavelength is located at 1950.02 nm, the maximum output power of the laser is 35 m WN 53 m W / W 73 MW, and the slope efficiency is 5. 5% and 8. 7% respectively. Multi-longitudinal-mode laser output is realized on gain fiber with length of 5 cm and 10 cm. The wavelength of laser is at 1949.95 nm and 1950.01 nm, the maximum output power of laser is 89 MW and 165 MW, the slope efficiency is 10.1% and 17.0%, respectively.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ171.771

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