| 题名 | 掺Yb<sup>3+</sup>氟磷酸盐玻璃物化和光谱性能及结构的研究 |
| 作者 | 董擎雷 |
| 学位类别 | 硕士 |
| 答辩日期 | 2008 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 胡丽丽 |
| 关键词 | 掺镱超短脉冲激光 Yb <sup>3+ <sup>离子 光谱激光性质 拉曼振动峰 |
| 其他题名 | The study of physical chemistry and spectra properties and structure of Yb3+ -doped alkaline metal modified fluorophosphates glass |
| 中文摘要 | 超短脉冲激光是一种重要的激光光源，它是物理学，化学，生物学，光电子学以及激光光谱学等学科对微观世界进行科学研究和揭示新的超快过程的重要手段。目前应用最多的超短脉冲激光是以钛宝石激光晶体作为工作物质的。掺镱激光材料由于其能级结构简单、发光谱较宽、泵浦方式简单、量子效率高等优点，有希望成为新一代超短脉冲激光器的激光工作物质。但是目前作为超短脉冲激光介质的掺镱磷酸盐和硅酸盐玻璃的普遍缺点是增益谱线尖锐，脉宽较长，超短脉冲输出功率不高等等。因此，寻找增益带宽更大的掺镱基质材料，更好地满足超短脉冲激光器的要求是一项有意义的工作。由于超短脉冲激光需要增益介质在较宽的频带上有一平坦的增益波型，所以本文以掺镱氟磷玻璃为研究对象，系统研究了Yb3+离子在简单氟磷玻璃体系中的光谱性能、物理和化学性能、结构性能以及析晶性质随玻璃成分变化的规律，以及各种碱金属氟化物对氟磷玻璃物理化学性质、析晶性质以及光谱激光性质的影响，这些基础研究可以为今后发展掺镱氟磷玻璃提供一定的参考。 论文主要内容有两个部分：第一：碱金属氟化物对掺Yb3+(1mol％)氟磷酸盐玻璃性质和光谱参数的影响；第二：不同浓度YbF3(1-5mol%)对简单二元氟磷酸盐玻璃性质和光谱参数的影响。 1mol%YbF3的掺入，使得简单二元氟磷玻璃体系的成玻璃能力得到加强。在引入碱金属氟化物的三元体系中掺杂YbF3后破坏了网络完整性，降低了系统析晶稳定性能，与碱土金属三元体系的情况相反。碱金属氟化物的引入对玻璃的光谱参数和析晶性能的影响与碱金属的种类相关。碱金属氟化物的引入可提高二元体系的析晶稳定性能，使玻璃网络结构得到改善； LiF的引入对Yb3+离子吸收和发射截面的提高作用较大，并出现最佳引入量极值，其次为KF。对不同厚度样品的荧光寿命测试结果显示，该玻璃体系的荧光捕获效应较低。红外透过光谱显示[OH-1]吸收系数仅为0.0695cm-1，该玻璃体系中水对荧光寿命的影响不大。 对于不同浓度YbF3(1-5mol%)的掺杂，首先研究了抗析晶性能的变化，YbF3的掺入可提高二元体系的析晶稳定性能，使玻璃网络结构得到改善，当YbF3掺入量为4mol％，抗析晶能力ΔT出现极大值，随着YbF3继续掺入，玻璃网络结构遭到破坏，使玻璃系统抗析晶能力下降。其次通过光谱性能和荧光光谱的分析，表明随YbF3含量增加τf增大，从1.32ms增大到1.58ms，但增益性能参数(σemiτf)却不断变小。最后，Raman 光谱显示随YbF3的不断掺入，网络聚合程度先增加后减弱，与析晶性能的分析结果相一致，系统的成玻璃能力呈相同的变化趋势。 |
| 英文摘要 | Ultra-short-pulse laser is an important laser source for physics， chemistry， biology， optoelectronics and laser spectrography in studing the microstructure and new ultra-fast processes. Presently, Ti : sappire is widely used as the laser material for this kind of laser device. Yb3+ doped laser material is a new candidate for the ultra-short pulse laser application because of its broad fluorescent spectrum and high quantum efficiency. But the defects of the present Yb3+ doped phosphate and silicate glasses for ultra-short-pulse laser are their sharp gain profile, longer pulse and relatively lower ultra-short-pulse output power. It is valuable to explore new Yb3+ doped glass matrix for realizing high-power ultra-short-pulse laser. Ultra-short-pulse laser requires the gain media having a flat profile over a wide wavelength range. So in this work, fluorophosphate glass that performs priority in ultra-short-pulse laser was studied. The spectroscopic, physical and chemical properties，structure and crystallization properties of Yb3+ doped fluorophosphate glass were investigated in this work. The effect of alkaline metal fluoride and YbF3 on the spectroscopic properties, physical and chemical properties，structural properties and crystallization properties of Yb3+ doped fluorophosphate glass were discussed. This fundamental study will be beneficial to the future research. There are two main parts in the thesis. One is the impact to the spectroscopic properties, physical and chemical properties，structural properties and crystallization properties of Yb3+ doped fluorophosphate glass when introducing different alkaline metal fluoride. The other is the influence of the spectroscopic properties, physical and chemical properties，structural properties and crystallization properties of simple binary fluorophosphate glass when introducing different amounts of YbF3. The glass forming ability of simple binary glass system was strengthened at the introduction of 1mol%YbF3, but the structure of ternary glass system(with alkaline metal) was destroyed at the introduction of 1mol%YbF3, and the crystallization properties decreased. Different alkaline metal fluoride had different effects on the spectroscopic properties and crystallization properties of the fluorophosphate glass. Alkaline metal fluorides improve the crystallization stability of binary system and strengthen the glass network. Results showed that LiF increases the absorption and emission cross section and has optimal introduction amount, then is KF. Test on fluorescence life-time of different thickness sample indicates the weak phenomenon of fluorescence capture. It was concluded from the infrared transmission spectra that [OH-1] amount was rare and had faint influence to the fluorescence life-time. The crystallization property was first studied in 1-5mol% YbF3 doped fluorophosphate glass. It was found that the introduction of YbF3 apparently improved the glass forming ability and crystallization stability at 1-4mol% YbF3 doping level. The crystallization stability performed the maximum ΔT value at the introduction of 4mol％ YbF3. With 5mol% YbF3 addition, the crystallization stability decreased, and the network structure of fluorophosphate glass was destroyed. The spectroscopic property parameters and the fluorescence spectra were then investigated. The results showed that the more YbF3 was, the bigger τf was, fluorescent lifetime varies from 1.32ms to 1.58ms, but the laser gain parameter (σemiτf) decreased gradually with YbF3. Finally, Raman spectra analysis showed that glass structure was obviously changed by YbF3 doping. With the gradual doping of YbF3, the network structure was enhanced at the beginning, and then weakened. The glass forming ability had the same trend. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16392]  |
| 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 | 董擎雷. 掺Yb<sup>3+</sup>氟磷酸盐玻璃物化和光谱性能及结构的研究[D]. 中国科学院上海光学精密机械研究所. 2008. |
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