掺铋磷酸盐玻璃光纤宽带发光特性的研究
文献类型：学位论文
| 作者 | 王晓琳 |
| 学位类别 | 硕士 |
| 答辩日期 | 2012 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 张军杰 |
| 关键词 | 铋掺杂，宽带发光，磷酸盐玻璃和光纤 |
| 其他题名 | The research on broadband luminescence properties of Bi-doped phosphate glass and fiber |
| 中文摘要 | 铋掺杂材料荧光能覆盖1.1-1.6μm范围波段，因而能够作为光纤放大器和光纤激光器的材料，在光通信、医疗和工业方面有重要的应用。本文的主要目的是探索光谱性能优良的铋掺杂磷酸盐玻璃基质组成，拉制出铋掺杂磷酸盐玻璃光纤进而研究其光谱和激光性能。 论文第一章首先介绍了铋掺杂材料作为光纤放大器和光纤激光器基质材料的应用前景，其次综述了铋掺杂玻璃和光纤材料的研究进展，总结了关于铋宽带近红外发光机理的不同观点，介绍了磷酸盐玻璃的组成、结构及作为激光玻璃的性质，最后提出了本论文的研究思路和内容。 论文第二章介绍了本论文的实验研究方法，包括玻璃样品的制备和光纤的拉制、玻璃样品的测试、光谱性能的计算及光纤的测试方法。 论文第三章研究了铋掺杂磷酸盐玻璃物理化学及宽带发光光谱性质。论文首先确定了铋掺杂磷酸盐玻璃的基质组成。在P2O5-Al2O3玻璃基质的基础上，引入了适量的B2O3来改善玻璃的性能，测试了P2O5- B2O3-Al2O3-Bi2O3(PBA：Bi)玻璃的光谱性能，玻璃样品在多种波长激光二极管激发下均有近红外宽带荧光，中心波长从1148nm变化至1260nm。当玻璃样品在532nm激光波长激发下，有最宽的荧光半高宽达到312nm，在808nm和980nm激光二极管激发下宽带荧光峰值波长处的拟合寿命分别为587μs和437μs。计算了808nm激光激发下铋在玻璃样品中的受激发射截面(em)为0.92 10-20 cm2。引入La2O3改善玻璃样品的热稳定性和抗析晶性能，实验中发现La2O3含量为9mol%时玻璃样品具有最佳的热稳定性，论文中也通过探讨La2O3对玻璃结构的影响解释了玻璃样品热稳定性和抗析晶性能变好的原因。优化了Bi2O3在玻璃样品中的浓度，发现Bi2O3含量为1mol%时，玻璃样品具有最佳的荧光性能。确定了单掺杂铋磷酸盐玻璃基质组成为67.5P2O5- 13.5B2O3- 9Al2O3-9La2O3-1Bi2O3。其次论文引入了Yb2O3作为敏化剂并探讨了其对铋活性中心近红外宽带发光的影响。实验中发现，引入Yb2O3后，玻璃样品在800-1000nm的吸收明显增强，其中966nm处的吸收系数是未引入时的5.1倍。同时， Yb2O3的引入使玻璃样品在980nm激光二极管激发下的近红外宽带荧光强度明显增强，当Yb2O3浓度为8mol%时，玻璃样品有最大的荧光强度约为未引入前的37.3倍。峰值波长处的荧光寿命大幅度延长，当Yb2O3浓度为5mol%时，其荧光寿命为1029μs。探讨了Yb3+和铋活性中心之间的能量转移机制，并通过对Yb单掺和Yb/Bi共掺的玻璃样品中Yb3+离子的1005nm的荧光寿命的测试计算出Yb3+和铋活性中心之间的能量转移效率(ET)最大能够达到59.1%。最后，总结了铋常见存在形式如Bi5+、Bi3+、Bi2+、Bi+离子及Bi0原子、Bi2和BiO分子的已知光谱特性和能级结构，并通过对不同熔制时间下玻璃样品在不同波长激光二极管激发下表现出来的不同规律进行讨论，探讨了Bi近红外宽带荧光的来源，认为玻璃样品中808nm激发下的宽带荧光来源于Bi0原子的2D3/24S3/2跃迁，而980nm激发下的宽带荧光则来源于Bi+离子的3P13P0跃迁。 论文第四章以Yb/Bi共掺的P2O5-B2O3-Al2O3-La2O3 (PBAL)玻璃基质为基础，设计了符合光纤拉制要求、能够相互匹配的芯层和内外包层玻璃组分，优化了大尺寸、均匀的光学玻璃熔制工艺，和光纤拉制中各种工艺系数，最终拉制出了两种不同结构Yb/Bi共掺磷酸盐玻璃双包层光纤，并测试了其荧光和激光性能。 论文第五章总结了全文的实验结果，并指出了不足和需进一步研究之处。 |
| 英文摘要 | Because the luminescence of Bi-doped materials can cover the range of 1000-1600nm, it has important applications on the optical communication, medical care and industry as the fiber amplifier and fiber laser materials. The important motivation of this thesis is to explore the Bi-doped phosphate glass composition with excellent spectrum performance, draw the Bi-doped phosphate fiber and research its spectral and laser properties. In the first chapter, we introduce the applications of Bi-doped materials, overview their research progress, summary different views of the origin of this broadband near-infrared (NIR) luminescence, introduce the composition, structure and properties of phosphate glass, and put forward the ideas and content of this thesis. In the second chapter, experimental research methods are introduced, which contents the preparation methods of the glass and fiber, the test methods and the calculation of glass spectral performance. In the third chapter, the physical, chemical and spectral properties of Bi-doped phosphate glass are studied. Firstly, the composition of Bi-doped phosphate glass is determined. On the base of P2O5-Al2O3 glass, the B2O3 is introduced to improve the properties of the glass. We measure its spectral properties, and obtain the maximum FWHM of 312nm under 532nm laser excited, the fitting fluorescence lifetime of 587 and 437μs in the peak wavelength under 808 and 980nm excited respectively, and the stimulated emission cross section of 0.92×10-20 cm2 under 808 nm excited. The La2O3 is introduced to improve the thermal stability and anti - crystallization property of the glass and it is found that the optimum concentration of La2O3 is 9 mol%. We optimize the Bi2O3 concentration, and find that when the concentration of Bi2O3 is 1mol%, the glass has best spectral properties. So we determine the glass composition of 67.5P2O5- 13.5B2O3- 9Al2O3-9La2O3-1Bi2O3. Then the effect of Yb3+ on the NIR luminescent properties and mechanism of luminescence of Bi-ions are investigated. Under the 980 nm LD excitation, the NIR emission intensity of the glass with 8 mol% Yb2O3 co-doped is ~37 times stronger than that of Bi singly-doped glass, and the fluorescence lifetime of the glass is 1029μs with 5 mol% Yb2O3 co-doped. By measuring fluorescence lifetime at 1005nm of Yb and Yb/Bi co-doped glasses, we obtain the largest efficiency of energy transfer of 59.1%. It is also suggested that the broadband NIR luminescence pumped by 808 nm and 980 nm LDs derives from Bi0: 2D3/2→4S3/2 and Bi+: 3P1→3P0, respectively. In the fourth chapter, based on the Yb/Bi co-doped P2O5-B2O3-Al2O3-La2O3 (PBAL) glass and we design the constituent of core, inner cladding and outer cladding glasses, optimize the large size optical glass melting process, explore the parameters during the fiber-drawing process, draw two kinds of Yb/Bi co-doped phosphate fibers with different structures and measure their spectral and laser properties. Finally, all results of present work are outlined, and it is suggested that something should be done in the next stage. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16730]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 王晓琳. 掺铋磷酸盐玻璃光纤宽带发光特性的研究[D]. 中国科学院上海光学精密机械研究所. 2012. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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