本文選題：鋇鎵鍺酸鹽玻璃 + 單模光纖��； 參考：《華南理工大學》2015年碩士論文

【摘要】：2μm波段激光在大氣監(jiān)測、激光雷達、激光醫(yī)療和光譜學等領域有著廣泛的應用。傳統(tǒng)最常用的石英光纖稀土摻雜濃度較低,限制了激光輸出性能。近年來,國內外越來越多學者把目光轉向稀土溶解度高的多組分玻璃。在多組分玻璃中,鋇鎵鍺酸鹽玻璃兼具了優(yōu)異的光學性質和良好的物化和機械性能,是2?m波段光纖激光器理想的基質材料。然而,目前大多數(shù)研究僅限于鋇鎵鍺酸鹽玻璃中稀土離子光譜性質的分析,還未克服制備高質量鋇鎵鍺玻璃光纖的一些關鍵性障礙。本文通過探究鋇鎵鍺酸鹽玻璃的抗析晶性能、除水工藝以及光纖制備工藝,研制出性能優(yōu)異的高摻Tm3+鋇鎵鍺玻璃單模光纖。在此基礎上,通過全光纖激光實驗分析了高摻Tm3+鋇鎵鍺玻璃單模光纖的激光輸出性能,具體的研究內容及成果如下:(1)結合玻璃DSC熱分析、保溫熱處理和拉絲實驗,探究了玻璃的抗析晶性能。研究表明在鋇鎵鍺玻璃中摻雜少量的La2O3和Y2O3能有效提高玻璃的熱穩(wěn)定性;同時研究發(fā)現(xiàn)除水工藝會影響玻璃的抗析晶性能,采用反應氣氛法和引入氟化物除水會降低玻璃的抗析晶性能,而鼓入干燥O2除水可以避免除水過程對玻璃抗析晶性能的損害。(2)通過探究鼓入干燥O2除水工藝的通氣時間、通氣流量和通氣溫度對除水效率的影響,優(yōu)化了鼓入干燥O2除水工藝。結果表明優(yōu)化的除水工藝能有效去除鋇鎵鍺玻璃中的OH-,除水后玻璃的羥基吸收系數(shù)為未除水空氣中制備玻璃羥基吸收系數(shù)的1/10。(3)制備了抗析晶性能優(yōu)異且羥基含量低的均勻無氣泡大塊鋇鎵鍺纖芯玻璃,以及與纖芯玻璃物化性能匹配的包層玻璃,纖芯中Tm3+摻雜濃度7.6×1020 ions/cm3。采用管棒法工藝在光纖拉絲塔中拉制了連續(xù)無析晶的高摻Tm3+鋇鎵鍺單模光纖,纖芯直徑為9.2?m,包層直徑為125?m,光纖數(shù)值孔徑為0.132。(4)采用DBR諧振腔結構,利用自制瓦級1568 nm光纖激光器為泵浦源,在長度為1.6 cm、2.1 cm、2.5 cm的增益光纖上實現(xiàn)了單頻激光輸出,激光輸出波長位于1950.02 nm,激光最大輸出功率分別為35 m W、53 m W、73 m W,對應的斜率效率分別為5.5%、8.7%、10.1%。在長度為5 cm和10 cm的增益光纖上實現(xiàn)了多縱模激光輸出,激光波長分別位于1949.95 nm和1950.01 nm,激光最大輸出功率分別為89 m W和165 m W,斜率效率分別為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.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ171.771

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本文編號：1842040