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题名	掺镱玻璃的Stark分裂与单频光纤预制棒选材研究
作者	杨斌华
学位类别	硕士
答辩日期	2014
授予单位	中国科学院上海光学精密机械研究所
导师	张丽艳
关键词	掺镱光纤材料 Yb3+ Stark能级分裂 氟磷玻璃
其他题名	Investigation on the Stark splittings of Yb3+-doped glasses and the material selections for single frequency fiber preform
中文摘要	掺镱单频光纤具有窄线宽、相干长度长和噪声小等优势，因在遥感技术、天文学、气象观测、工业、医疗以及军事等领域具有重要的应用而得到了广泛关注和快速的发展。虽然石英光纤中低的Yb3+掺杂浓度造成了其难以在短直线腔中实现稳定的较高功率激光输出，但到目前为止，石英光纤仍是主要的掺镱单频光纤材料。由于磷酸盐玻璃光纤具有高Yb3+掺杂浓度、高荧光寿命及高发射截面的优势，近几年来，掺镱磷酸盐单频光纤在线性超短腔输出上取得了重要的进展，成为了非常有应用前景的掺镱单频激光光纤。但实验发现，掺镱磷酸盐玻璃块体即便是在低温条件下也很难实现激光输出，本课题意图寻找其原因所在，为此进行了Yb3+在常用激光玻璃系统中的Stark分裂研究。鉴于在与磷酸盐玻璃具有一定相似性的掺镱氟磷玻璃中已经获得了远优于掺镱磷酸盐玻璃的激光输出，因此课题选取了掺镱氟磷玻璃作为单频光纤预制棒的芯棒材料，进行了芯-包选材及匹配性研究。本课题主要包括以下六个部分：文献综述；实验方法与理论计算；Yb3+离子在不同基质玻璃中能级Stark分裂情况的研究；氟磷玻璃组份、稳定性和光谱性能的研究；异质光纤预制棒用块体玻璃的熔制；结论。 本论文在文献综述中简述了掺镱单频激光光纤的广阔应用领域和发展状况；介绍了Yb3+离子的能级结构优势和单频光纤实现的两种腔型；接着，简述了几种常见掺镱激光玻璃基质材料的发展和各自的优缺点，其中着重介绍了氟磷玻璃材料的结构和优势；针对掺镱单频光纤材料的研究现状和相关调研知识，提出了本论文的思路和研究内容。 第二部分简述了本论文实验中样品的制备方法和过程；介绍了实验过程中对样品进行各种测试时所用到的仪器和参数；介绍了实验数据处理过程的理论基础和计算方法。 第三部分研究了低温和常温下几种掺镱激光玻璃基质材料中不同的Yb3+能级Stark分裂情况，从Yb3+能级精细结构的角度对掺镱材料进行选取；同时分析对比不同掺镱激光玻璃中Yb3+的光谱性能及其它因素，选择了与磷酸盐性质较为相近的氟磷玻璃基质作为下文的研究对象。 第四部分进行了大量的氟磷玻璃组分调整实验，研究了Al(PO3)3与BaF2的、BaF2与SrF2的和MgF2与CaF2相对含量的改变对氟磷玻璃性质的影响；分别以MgO、CaO、SrO和BaO取代氟磷玻璃组分中等摩尔量的MgF2、CaF2、SrF2和BaF2，研究了其变化对氟磷玻璃性能的影响；研究了重金属氧化物TeO2、Bi2O3、WO3、Ga2O3及Nb2O5和金属氧化物GeO2的加入对氟磷玻璃光谱和激光性能的影响。 第五部分具有针对性地调整并获得了性能较为优异的氟磷玻璃组分；熔制了大块氟磷玻璃作为预制棒的芯棒，磷酸盐块体玻璃作为包层，并加工制备了预制棒，为后续双包层玻璃异质光纤的拉制做准备工作。 最后，对全文做了总结，提出课题研究中存在的不足以及下一步需要改进和提高的地方。
英文摘要	Yb3+-doped single frequency fiber with the advantages of narrow linewidth, long coherence length, and low noise has got comprehensive attentions and rapid development for important applications in remote sensing technology, astronomy and meteorological observation, industrial, medical, military fields, etc. Although it’s difficult to acquire the stability output of high power single frequency laser in short linear cavity for the low Yb3+-doped concentration in silica, the silica fiber is still one of the main matrix materials for single frequency fiber, up to now. Yb3+-doped phosphate glass of high Yb3+-doped concentration, high fluorescence lifetime, and high emission cross section, having made significant progress as the gain material in ultra-short linear cavity for single frequency laser output, is of considerable importance as an Yb3+-doped single frequency laser fiber. But the researches show, it’s hard to realize the laser output in bulk phosphate glass even at the low temperature. Investigations of the Stark splittings of Yb3+ in the common laser glass systems are carried on for the reason in our paper. In view of that the laser output in Yb3+-doped fluorophosphate glass with some similar properties of phosphate glass has shown far better than that in Yb3+-doped phosphate glass, we study the adoption of materials for the core-rod and cladding of Yb3+-doped single frequency double clad fiber and the matching of the two cladding materials based on choosing fluorophosphate glass as core-rod matrix material. Our paper mainly includes the following six parts: Literature review; Experimental method and theoretical calculation; Investigations on the Stark splittings of Yb3+-ions in different glass matrices; Researches on the component of fluorophosphate glasses, and their stability and spectral properties; Melting of bulk glass and processing for heterogeneous optical preform; Conclusion. Firstly, in literature review, it describes the wide application fields and developments of Yb3+-doped single frequency fiber laser briefly. The advantages of Yb3+-ions structure and the two cavities utilized for realizing single frequency laser output are introduced. Then, the developments of Yb3+-doped glass matrix materials are introduced, of which the advantages and disadvantages are contrastively summarized, specifically for fluorophosphate glass. At length, the research status of Yb3+-doped single frequency fiber is presented, and the significances and contents of the research are put forward. In section 2, the method and process for the preparation of the samples in the experiment are introduced. Meanwhile, the instruments and parameters used for all the tests on the samples are presented. To the end, the basic theory and calculation method of experimental data are also described. In section 3, the Stark splittings of Yb3+-ions level in different laser glass matrices at the low temperature and room temperature are studied, giving practical guidances for adopting appropriate glass matrix as Yb3+-doped single frequency fiber. Considering with the spectroscopic properties of Yb3+ and other factors in different laser glasses, we choose fluorophosphate glass with some similar properties of phosphate glass as the object of the study in next. In section 4, large numbers of researches are carried on for adjusting the fluorophosphate glass components. The effects on the properties of fluorophosphate glass through changing the relative contents of Al(PO3)3 and BaF2,BaF2 and SrF2, MgF2 and CaF2 are researched, respectively. The influences on the properties of fluorophosphate glass by substituting the components of BaF2, SrF2, MgF2 and CaF2 with the equmolar amounts of BaO, SrO, MgO and CaO are discussed, respectively. Besides, the influences of the dopants of several heavy metal oxides and GeO2 on spectroscopic and lasing properties of Yb3+-doped fluorophosphate glasses are studied. In section 5, adjusting fluorophosphate glass component largely and appropriately, one of excellent performance is adopted for the core-rod manufacturing. The bulk glasses are melted and the core-rod and cladding are processed for the drawing of Yb3+-doped double clad heterogeneous glass fiber in future, of which the Yb3+-doped fluorophosphate glass is used as the core-rod and phosphate glass as the cladding. Finally, the results of the thesis are summarized and the problems and insufficiencies existing in the research are listed. Besides, the next step and work needed to be improved further are suggested.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16865]
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	杨斌华. 掺镱玻璃的Stark分裂与单频光纤预制棒选材研究[D]. 中国科学院上海光学精密机械研究所. 2014.

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