| 题名 | 掺稀土锗碲酸盐玻璃2μm光谱性能研究 |
| 作者 | 彭雅珮 |
| 学位类别 | 硕士 |
| 答辩日期 | 2013 |
| 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 | 锗碲酸盐玻璃 中红外光谱 稀土掺杂 2μm发射 |
| 其他题名 | 2μm spectroscopic properties of rare earth ions doped germanate-tellurite glasses |
| 中文摘要 | 2μm激光在众多领域上具有广泛的应用因而渐渐受到瞩目，例如：遥感、人眼安全雷达、环境监测、医疗手术等领域。目前国内外已有大量2μm激光的相关报道。因此本论文主要目的是研究一种适用于2μm发光的新型玻璃基质材料。由于锗碲酸盐玻璃结合了锗酸盐玻璃和碲酸盐玻璃的各自优点，在锗酸盐玻璃体系中加入少量氧化碲化合物，可降低锗酸盐玻璃基质的声子能量和熔制温度，同时保留了锗酸盐玻璃良好的光谱性能。锗碲酸盐玻璃还具有成分可调性大和稀土掺杂浓度高的优点，为未来2μm超短脉冲激光应用提供了一种合适的激光材料。 本论文主要分为五章： 论文第一章首先在文献综述中介绍了稀土离子种类和稀土离子的跃迁原理，然后综述了2μm稀土离子掺杂玻璃基质材料的研究发展和应用在2μm单频激光、超短脉冲激光的研究发展，最后提出了本课题主要的研究内容和思路。 论文第二章介绍了实验方法和基础理论，包括玻璃的制备和加工、光谱理论的计算和分析方法等。 论文第三章研究了不同锗碲酸盐玻璃组分的光谱性质，首先在第一小节通过玻璃组分中氧化铌和氧化镧组分相对含量的调整，制备一系列的锗碲酸盐玻璃，研究其玻璃的热学和光学性质。通过DSC测试，玻璃样品GTLa-5的Tg为545.3℃，且并没有观察到明显的析晶峰。通过吸收光谱、Judd-Ofelt强度参数计算、受激发射截面等研究分析，计算得到锗碲酸盐玻璃GTLa-1中Tm3+:3F4→3H6能级的自发辐射跃迁几率为372s-1，且在1810nm波长处锗碲酸盐玻璃的受激发射截面高达13.5×10-21 cm2。最终获得抗析晶性能和2μm发光性能良好的锗碲酸盐玻璃70GeO2–10TeO2–10K2O–8Nb2O5–1La2O3–1Tm2O3，说明Tm3+掺杂锗碲酸盐玻璃具有发展2μm激光的潜力。在第二小节中，研究了不同Tm3+离子掺杂浓度的锗碲酸盐玻璃的热学和光学性质。通过玻璃的吸收光谱和Judd-Ofelt理论分析，计算了玻璃样品GTPZN-2/60GTPZN-1.0中Tm3+:3F4→3H6能级自发辐射跃迁几率为423s-1和辐射寿命为2.36ms，自发辐射跃迁几率大有利于2μm跃迁发射。通过McCumber理论计算受激发射截面，锗碲酸盐玻璃组分GTPZN-2/60GTPZN-1.0在1860nm得到最大发射截面为6.91×10-21 cm2。通过吸收和受激发射截面计算了玻璃中Tm3+离子的增益，当P ＞ 0.4，开始在锗碲酸盐玻璃中获得正增益的特性，随着P值的增加，增益截面跟着增加，且增益带最高峰的中心波长也随之往长波方向移动。即泵浦功率的提升，将造成激光中心波长往长波长方向飘移，说明了符合典型准三能级激光系统。最终获得抗析晶性能良好、2μm发光性能强和增益性能优异的锗碲酸盐玻璃60GeO2–15TeO2–4PbO–10ZnO–10Na2O–1Tm2O3，表明此Tm3+离子掺杂锗碲酸盐玻璃是一种合适的2μm激光材料。 论文第四章主要研究了稀土离子双掺的锗碲酸盐玻璃2μm的光谱性能。通过Ho3+/Yb3+离子共掺的方式，制备出一系列不同Yb3+离子掺杂浓度的锗碲酸盐玻璃样品，并进行了光谱性质的研究分析讨论。利用吸收光谱和Judd-Ofelt理论计算得到锗碲酸盐玻璃GTLaF-1.0中Ho3+:5I7→5I8跃迁的自发辐射跃迁几率为88.19s-1，辐射寿命为11.3ms。随着锗碲酸盐玻璃中Yb3+离子掺杂浓度的增加，锗碲酸盐玻璃2μm的荧光发射也随着明显增强，当Yb3+离子掺杂浓度达1 mol.%时，获得最大的2μm荧光强度。这是由于Yb3+离子浓度增加，其吸收的980nm泵浦光能量也跟着增加，所以进一步通过有效的能量转移将能量转移给Ho3+离子，使得Ho3+:5I7→5I8跃迁得到有效的增加，获得2μm荧光的增强。利用吸收光谱和McCumber理论计算，获得锗碲酸盐玻璃GTLaF-1.0中的Ho3+离子在2μm附近的受激发射截面为4.32×10-21cm2，高于其他基质玻璃材料。表示Ho3+/Yb3+共掺锗碲酸盐玻璃70GeO2-10TeO2-10K2O-8Nb2O5-2LaF3-1Ho2O3-1Yb2O3具有良好的发光性能，且Yb3+离子能有效的将能量转移给Ho3+离子，获得较强的2μm荧光。 最后为本论文的结论部分，概括了全文的实验研究结果和创新点，同时指出了本研究课题存在的不足及需要补充改进之处。 |
| 英文摘要 | The development of compact solid state lasers operating in the 2μm wavelength region has been extensively investigated driven by various applications, such as remote sensing, eye-safe laser radar, atmosphere pollution monitoring, and laser medical surgery. The motivation of this research is to investigate a novel glass material suitable for 2μm. The germanate-tellurite glass combine the various merits of germanate glasses and tellurite glasses. A small amount of oxidation tellurium compounds have been joined to germinate glass system to decrease the phonon energy and melting temperature and increase the glass chemical stability, while retain the good spectral properties of germanate glass. Germanate-tellurite glasses possess composition adjustable and high rare-earth doped concentration. In the future, it provides an ideal suitable laser material for 2μm urtrashort pulse laser. This dissertation includes the following five chapters. Firstly, the classes and transitions of rare earth ions have been introduced. And the developments and applications of laser have been briefly introduced. Then, the purpose and research content of the dissertation were proposed. Secondly, the all kinds of experimental methods and theory analysis were introduced, including the preparation and processing of sample, the spectroscopy, and spectral analysis, etc. Thirdly, in part one, a series of germanate-tellurite glass have been prepared and discussed by changing the relative concentrations of the type and content of niobium oxide and lanthanum oxide compounds. The glass transition temperature of GTLa-5 was 545.3℃ by differential scanning calorimeter (DSC), and no onset crystallization peak were observed. The Judd-Ofelt parameters and absorption and emission cross section of GTLa-1 has been calculated by the absorption spectrum. The spontaneous radiation transition probability is 372s-1, and the emission cross section at 1810nm is as high as 13.5×10-21cm2. The result shows the Tm3+-doped germanate-tellurite glass is potential for 2μm laser materials. In part two, a series of germanate-tellurite glasses with 2μm emission have been investigated by changing Tm3+ ions doping concentrations. The spontaneous radiative transition probability and radiative lifetime of 60GTPZN-1.0 is 423s-1 and 2.36ms, respectively. The high spontaneous radiative transition probability is useful for 2μm emission. The emission cross section of 60GTPZN-1.0 is calculated to be 6.91×10-21cm2 by McCumber theory. We can obtain the positive gain when P > 0.4. Gain cross section followed by increased with the increase of P values, and the center wavelength of gain also shifted to long wavelength direction. It reveals the laser performance wavelength with the maximum gain varies as pump power is increased which is a typical feature of the quasi-three-level laser system. The experimental results revealed that the Tm3+-doped germanate-tellurite glass is a promising candidate for 2μm laser. Fourthly, the 2μm emission spectra and energy transfer mechanism of Ho3+/Yb3+ codped germanate-tellurite glasses have been investigated. Efficient 2.0μm emission of Ho3+ ions sensitized by Yb3+ ions from the host glass is observed under 980nm pumping. Based on the measured absorption spectra, the Judd-Ofelt parameters were calculated and discussed. And the radiative transition probability and lifetime of Ho3+:5I7→5I8 in GTLaF-1.0 is 88.22s-1 and 11.33ms, respectively. The maximum value of the 2μm emission intensity can been observed at the concentration of 1.0 mol.% Yb2O3 codoped with 1.0 mol.% Ho2O3. It can be illustrated that 2μm emission from Ho3+ ions could be enhanced by the efficient energy transitions of Yb3+ ions when pumping at 980nm. The maximum emission cross section of Ho3+ ions transition is 4.32×10-21cm2 around 2μm. The good spectroscopic properties and the efficient energy transfer from Yb3+ to Ho3+ suggest that Ho3+/Yb3+ codoped germanate-tellurite glass may become an attractive host for developing solid state lasers operating in the mid-infrared. Finally, it was the conclusion of this dissertation, which generalized the innovative results of this dissertation and pointed out the drawbacks that needed to be improved. |
| 语种 | 中文 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16759]  |
| 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 | 彭雅珮. 掺稀土锗碲酸盐玻璃2μm光谱性能研究[D]. 中国科学院上海光学精密机械研究所. 2013. |
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