Yb~(3+),Er~(3+)掺杂氟磷酸盐玻璃光谱和激光性质的研究
文献类型：学位论文
| 作者 | 张丽艳 |
| 学位类别 | 博士 |
| 答辩日期 | 2005 |
| 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 | 掺镜超短脉冲激光 光谱激光性质 宽带放大性质 上转换发光 |
| 其他题名 | The study of spectroscopic and lasing properties of Yb~(3+),Er~(3+) doped fluorophosphate 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。但是目前作为超短脉冲激光介质的掺镜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。在光纤通讯领域，计算机网络及其它数据传输服务的发展使长距离光纤传输系统对通信容量和系统扩展的需求日益膨胀，提高光通讯密集波分复用系统的传输容量迫在眉睫，但传统的石英基质EDFA由于其本身带宽的限制而不能满足这种需求。因此，寻找掺镜磷酸盐和硅酸盐以外的掺镜基质材料以获得新的高功率超短脉冲激光增益介质是一项很有价值的工作，并且通过新的掺Er3＋基质材料来实现光信号的宽带高增益放大对于光纤通信系统传输容量的扩展也具有非常重要的意义。由于超短脉冲激光和宽带EDFA都需要增益介质在较宽的频带上有一平坦的增益波型，所以本文以在掺镜超短脉冲激光和EDFA应用上具有优势的氟磷玻璃为研究对象，系统研究了Yb3＋和Er3＋离子在氟磷玻璃中的光谱激光性能、物理和化学性能、结构性能以及析晶稳定性能随玻璃成分变化的规律，并利用氟磷玻璃成分可调范围宽的特点获得了玻璃形成能力和发光性能俱佳的适合于超短脉冲激光器的掺镜氟磷玻璃和渐逝波泵浦掺饵光纤放大器的低折射率高饵浓度氟磷玻璃，同时也针对掺饵氟磷玻璃具有应用于上转换激光器的特性，研究了Er3＋在氟磷玻璃中的上转换光谱性质。有别于其它掺镜玻璃研究中只注重Yb3＋离子光谱性质的研究倾向，论文首先研究了以碱土金属氟化物为主的三元系统氟磷玻璃的成玻璃范围，并发现少量Yb3"离子的引入会使三元组分的玻璃形成范围明显加宽。Raman光谱分析显示，YbF3掺杂前后玻璃的结构发生较大变化，并使玻璃的析晶稳定性参数Tx一Tg平均提高3一4℃，结果证明稀土氟化物在氟磷玻璃里不仅是掺杂体，也作为网络中间体参与网络构筑。另外，从碱仁金属各离子特点和离子键强等角度分析了碱土金属氟化物对玻璃的光谱激光性质和析晶稳定性质以及玻璃结构的复杂影响，确定了Yb3＋离子的可能配位情况，并从结构出发分析了碱金属氟化物的引入可明显改善掺镜碱土金属氟磷玻璃一系列物理化学性能以及光谱激光性能的原因，证明混合碱效应同样存在于碱金属和碱上金属离子之！司。本部分还研究了啼磷两种网1丁－一，-----络形成体产生的混合形成体效应以及具有优良成玻璐性能的PbF2对掺镜氟磷玻璃发光性能和物理化学性能的影响，最终得出了各项物理化学性质优良的、有很好成玻璃性能及综合发光性能的复杂组分掺镜氟磷玻璃作为进一步微片激光实验的介质玻璃。对于掺饵氟磷玻璃，首先研究了B2O3和TeO2两种网络形成体对提高氟磷玻璃宽带性能的作用。利用Judd－OfeIt理论分析了Er3+在硼－氟磷玻璃中的光谱性能参数，根据计算结果得出了改善宽带性能同时保持较高荧光寿命（＞7．4ms）的BZO：的理想含量，并用晶体场对称性理论解释了B2O3改善氟磷玻璃宽带性能的原因。结果显示，适量B2o3有利于提高氟磷玻璃的析晶稳定性卜且可有效地抑制稀土离子的上转换；如果以硼代磷，则FWHM的提高幅度更大，同时荧光寿命仍能保持较高水平，但析晶稳定性下降，表明氟磷玻璃的析晶稳定性优于氟硼玻璃。讨论了含啼氟磷玻璃的两个极端TeoZ含量，即TeOZ成1otnolo／0或）30mol％，同时证明TeO2大于3Omol％时只有以P2O5引入磷才能形成玻璃，并获得了30mol％成TeOZ蕊70mol％的一系列完好玻璃，否定了TeO2和P2O5不能形成很好玻璃的观点。通过实验得出了蹄一氟磷玻璃的熔制时间是影响Er3＋离子光谱性能的一个重要因素。根据含蹄氟磷玻璃中J－O参数的计算结果和啼酸盐玻璃及氟磷玻璃的特点，证明了氟磷玻璃中引入TeO2，则Ω6和Sed/(Sed＋smd）对Er3＋离子带宽性能影响的常规判断方法没有适用性。第二，研究了氟磷玻璃中Yb3+对Er3＋的敏化效应随Er3＋离子浓度的改变，通过计算能量转移效率，得出要实现有效敏化，则Yb3＋：Er3＋比需根据不同Er3＋浓度决定而没有单纯的普遍适用的最佳Yb3+：Er3＋比例范围。上转换红光和绿光的相对强度随Er3＋浓度和Yb3＋：Er3+比的改变有很大变化，并分析了相应的上转换机制。通过对J-O理论推导过程的分析，得出合理使用Ω6和sed／（Sed＋smd）对Er3+离子带宽性能进行评价的一个必要的前提条件是要考虑不同的折射率分级集团。第三，研究了低折射率高饵浓度氟磷玻璃作为渐逝波泵浦光纤放大器增益介质的光谱和激光性质，首次获得了激光连续泵浦EWFA下的2dB的相对增益。探讨了低折射率掺饵氟磷玻璃的上转换机制，并首次获得了不同于以往p-PbF2型含铅微晶玻璃的无铅SrTe5O1I型微晶玻璃，使绿光上转换强度提高了120倍。 |
| 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. 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 the relatively lower ultra-short-pulse output power. The development of computer networks and other data-transmitting services requires fast increasing of communication capacity and the system expanding, and it is urgent to enhance the transmission capacity for densed-wavelength-division-multiplexing system. But the conventional silica based EDFA can not meet this requirement because of its intrinsic bandwidth limit. It is valuable to explore new Yb3+ and Er3+doped glass matrix for realizing high-power ultra-short-pulse laser and expanding the optical amplifier communication capacity. Both ultra-short-pulse laser and EDFA require the gain media having a flat profile over a wide wavelength range, so in this paper, fluorophosphate glass that performs priority in ultra-short-pulse laser and EDFA was studied. The spectroscopic and lasing properties, physical and chemical properties, structural properties and crystallization properties of Yb3+ and Er3+doped fluorophosphate glass were investigated in this work. Yb3+ doped fluorophosphate glass fitting for ultra-short-pulse laser and the low refractive index high Er3+ concentration doped fluorophosphate glass used in evanescent wave optical fiber amplifier (EWFA) were obtained with good luminescence quality and glass forming ability. The upconversion luminescence of Er3+ was studied at the same time according to the potential use of Er3+ doped fluorophosphate in the upconversion laser. Different from the works that emphasize the spectroscopic properties of YbJ+ in conventional researches, this dissertation first studied the glass forming range of the three-components alkaline-earth fluorides fluorophosphate glass. It was found that the introduction of small amount of Yb3+ apparently enlarged the glass forming range of this three-components fluorophosphate glass system. Raman analysis showed that the Yb3 glass structure is obviously changed by YbF3 doping. The crystallization stability parameter Tx-Tg is averagely enhanced 3~4°C. Results indicate that rare-earth fluoride is not only a dopant, but also an intermedia glass former which participating the network formation. The influence of alkaline-earth fluorides to the spectroscopic and lasing properties*, crystallization stability and structure of the glass was discussed from the point of the characteristic of the alkaline-earth ions and their ionic bond strength, and the possible ligand situation of Yb3+ is determined. The possible reasons for the improvement of physical and chemical qualities and spectroscopic and lasing properties with alkaline-earth fluorides introduction were investigated according to the structural analysis, which indicates that the mixed-alkali-effect exists between the alkali and alkaline-earth ions. The mixed-glass former-effect of TeCh in fluorophosphates glass was also studied, and the influence of PbF2, which performs excellent glass forming ability, to the luminescence, physical and chemical properties of the glass were discussed. A complicate-component glass with good physical and chemical qualities, good glass forming ability and luminescence property was achieved. It may be applied in the microchip laser. To the Er3+ doped fluorophosphate glass, the effect of glass former B2O3 and TeCh in improving the broadband property was discussed. Judd-Ofelt theory was used in calculating the spectroscopic parameters of Er3+ in boron-fluorophosphate glass and the ideal amount of B2O3 which can improve the broadband property and maitain the relatively higher fluorescence lifetime (>7.4ms) was determined according to the calculation results. The effect of B2O3 in improving the broadband property was explained using the crystal field symmetry theory. A conclusion that proper amount of B2O3 can effectively enhance the crystallization stability and depress the upconversion luminescence was achieved. With the substitution of boron to phosphate, FWHM performs even faster improvement and the fluorophosphate lifetime maintains high, but the crystallization stability decreases. It indicates that crystallization stability of fluorophosphate glass is better than that of fluoroborate glass. The influence of TeOi on the spectroscopic and glass forming properties was studied and two extreme TeC>2 amounts were determined in TeC>2 involved fluorophosphate galss. They are TeCh^ 10mol% and |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15398]  |
| 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 | 张丽艳. Yb~(3+),Er~(3+)掺杂氟磷酸盐玻璃光谱和激光性质的研究[D]. 中国科学院上海光学精密机械研究所. 2005. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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