掺铥硅酸盐玻璃的光谱特性及光纤制备研究

发布时间：2018-06-21 07:39

本文选题：铥离子 + 硅酸盐玻璃　；参考：《华南理工大学》2015年硕士论文

【摘要】：光纤激光器作为二十一世纪的新型激光源已经历了1.0μm、1.5μm的快速发展,正朝着中红外波段方向迈进,特别是2.0μm波段激光源。2.0μm波段激光在军事、医疗、空间通信等领域具有不可替代的作用。目前,虽然在石英和多种多组分玻璃光纤中已实现了2.0μm波段的激光输出,但是受制于高增益、高损伤阈值2.0μm波段光纤材料的缺乏,导致2.0μm波段脉冲光纤激光器的峰值功率难以进一步提高。石英光纤损耗低,制备工艺成熟,但是稀土离子溶解度较低,严重限制了其有源光纤增益的提高。而硅酸盐玻璃,具有稳定的物化性能、高的机械强度和良好的抗激光损伤阈值。并且,通过对硅酸盐玻璃组分的选择和调整,有望大幅度提高玻璃的稀土离子溶解度,进而获得高增益2.0μm波段有源光纤,为高峰值功率2.0μm波段脉冲光纤激光器奠定材料基础。本课题通过调整硅酸盐玻璃的组分和制备工艺,优化玻璃的光谱特性和拉丝性能,研究了掺铥硅酸盐玻璃光纤制备技术、光纤的性能以及它们间的相互关系。内容包括:(1)研究了硅酸盐玻璃组分对Tm3+:2.0μm波段发光性能的影响:在不同浓度Tm2O3掺杂的Si O2-Na2O-K2O-Ba O-Nb2O5-Sb2O3-Al2O3玻璃中,我们发现1 mol%Tm2O3掺杂样品的发光强度最大,并计算了此时Tm3+离子的三个J-O强度参数Ω2、Ω4、Ω6,其值分别为4.05、0.78和0.32,进而计算的1836 nm处的自发辐射寿命为5.96 ms。计算的最大吸收截面σabs为1.57×10-21 cm2,最大发射截面σem为3.34×10-21 cm2,最大增益系数为1.58 cm-1。这些较大的参数值表明此玻璃比较适合制备高增益掺铥硅酸盐玻璃光纤。(2)硅酸盐玻璃去除OH-的研究:研究发现,反应气氛法(O2+CCl4)除水方式对Si O2-Al2O3-Ca O-Ba O-Sb2O3玻璃的除水效果最好。但是,由于硅酸盐玻璃的熔制温度仍然较高,在除水气氛作用下,会引起Si O2-Na2O-K2O-Ba O-Nb2O5-Sb2O3-Al2O3玻璃中Na2O、K2O的大量挥发;在玻璃组分中引入氟化物并鼓入O2除水时,延长O2鼓泡时间和增加氟化物含量均有利于OH-的消除,并可提高掺铥Si O2-Na2O-K2O-Ba O-Nb2O5-Sb2O3-Al2O3玻璃的荧光强度,但降低了Si O2-Al2O3-Ca O-Ba O-Sb2O3玻璃的拉丝抗析晶性能。(3)Cr3+增强Tm3+:2.0μm波段荧光强度的研究:在1 mol%Tm2O3掺杂的Si O2-Na2O-K2O-Ba O-Nb2O5-Sb2O3-Al2O3-Tm2O3玻璃中引入Cr2O3,发现Cr2O3掺杂浓度为0.1 mol%时,采用430 nm氙灯激发,Cr3+→Tm3+之间的能量传递效率为40.97%;而采用808 nm LD激发时,Cr3+能有效增强Tm3+:2.0μm波段的荧光强度。但是,随着Cr2O3含量的增加,Tm3+:2.0μm波段的荧光强度随之下降。同时,我们结合能级图分析了Tm3+/Cr3+之间的能量传递机理。(4)掺铥硅酸盐玻璃光纤的制备研究:通过对玻璃组分的调整,优选出了适合制备硅酸盐玻璃光纤的玻璃配方,并采用管棒法拉制出了数值孔径为0.136,纤芯和包层直径分别为9.8μm和125μm的掺铥硅酸盐玻璃光纤。经截断法测试,光纤在1310 nm处的光传输损耗为19.01 d B/m。
[Abstract]:As a new type of laser source in the 21 century, fiber laser has experienced the rapid development of 1.0 渭 m and 1.5 渭 m, and is moving towards the mid-infrared band, especially the 2.0 渭 m laser source in military and medical fields. Space communication and other fields have an irreplaceable role. At present, the laser output of 2.0 渭 m band has been realized in quartz and multicomponent glass fiber, but it is limited by the lack of 2.0 渭 m optical fiber material with high gain and high damage threshold. It is difficult to improve the peak power of 2.0 渭 m pulsed fiber laser. The loss of quartz fiber is low and the preparation process is mature, but the solubility of rare earth ions is low, which seriously limits the increase of the gain of active fiber. Silicate glass has stable physical and chemical properties, high mechanical strength and good laser damage threshold. Moreover, by selecting and adjusting the composition of silicate glass, the solubility of rare earth ions of the glass will be greatly improved, and then the high gain 2.0 渭 m band active fiber will be obtained, which will lay the material foundation for the high peak power 2.0 渭 m band pulsed fiber laser. By adjusting the composition and preparation process of silicate glass, the spectral and wire drawing properties of glass were optimized, and the preparation technology of thulium doped silicate glass fiber, the properties of fiber and the relationship between them were studied. The effects of the composition of silicate glasses on the luminescence properties of TM 3: 2.0 渭 m band were studied. In Sio _ 2-Na _ 2O -K _ 2O-Ba O-Nb _ 2O _ 5-Sb _ 2O _ 3-Al _ 2O _ 3 glasses doped with TM _ 2O _ 3, the luminescence intensity of the doped samples was the highest. The three J-O intensity parameters 惟 _ 2, 惟 _ 4 and 惟 _ 6 of the TM ~ 3 ion are calculated, and the values are 4.05 ~ 0.78 and 0.32, respectively, and the calculated spontaneous emission lifetime at 1836 nm is 5.96ms. The calculated maximum absorption cross section 蟽 _ (abs) is 1.57 脳 10 ~ (-21) cm ~ (-2), the maximum emission section 蟽 _ (em) is 3.34 脳 10 ~ (-21) cm _ (2), and the maximum gain coefficient is 1.58 cm ~ (-1). These large parameter values indicate that the glass is more suitable for preparing high gain thulium doped silicate glass fiber. The study of removing OH- from silicate glass: it is found that the reaction atmosphere method can remove water from Sio 2 Al 2O 3 Ca O BA O Ba O O SB 2O 3 glass with the best water removal efficiency. However, because the melting temperature of silicate glass is still relatively high, it will cause a large amount of volatilization of Na _ 2O-K _ 2O-Ba O-Nb _ 2O _ 5-Sb _ 2O _ 3-Al _ 2O _ 3 glass in Sio _ 2-Na _ 2O-K _ 2O-Ba _ (O-Nb _ 2O _ 5-Sb _ 2O _ 3-Al _ 2O _ 3) glass under the action of removing water. Prolonging the time of O2 bubbling and increasing the content of fluoride can improve the fluorescence intensity of thulium doped Sio _ 2-Na _ 2O-K _ 2O-Ba O-Nb _ 2O _ 5-Sb _ 2O _ 3-Al _ 2O _ 3 glass. But the crystallization resistance of Sio _ 2-Al _ 2O _ 3-Ca O _ -Ba O-Sb _ 2O _ 3 glass was decreased. The results showed that Cr _ 2O _ 3 was used to increase the fluorescence intensity of TM _ 3: 2.0 渭 m band. When the concentration of Cr _ 2O _ 3 was 0.1 mol%, Cr _ 2O _ 3 was introduced into Sio _ 2-Na _ 2O _ 3-K _ 2O-Ba O-Nb _ 2O _ 3-Al _ 2O _ 3-Tm _ 2O _ 3 glass doped with Si _ 2-Al _ 2O _ 3-Ca _ 2O _ 3-Al _ 2O _ 3. The energy transfer efficiency between Cr 3 and TM 3 excited by 430 nm xenon lamp is 40.97, while that of Cr 3 excited by 808 nm LD can effectively enhance the fluorescence intensity of TM 3: 2.0 渭 m band. However, with the increase of Cr _ 2O _ 3 content, the fluorescence intensity of TM _ 3: 2.0 渭 m wave band decreases with the increase of Cr _ 2O _ 3 content. At the same time, we analyze the energy transfer mechanism between TM ~ 3 / Cr _ 3 and TM ~ (3 / Cr _ (3). The preparation of thulium doped silicate glass fiber is studied. By adjusting the composition of glass, the formula of glass suitable for preparing silicate glass fiber is selected. The thulium doped silicate glass fibers with a numerical aperture of 0.136, diameter of 9.8 渭 m and cladding diameter of 125 渭 m were fabricated by using tube rod Farah. The optical transmission loss of the fiber at 1310 nm is 19.01 dB / m ~ (-1) by truncation method.
【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】：TN253;TQ171.112

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