掺饵磷酸盐玻璃光谱性质与激光性质研究
文献类型：学位论文
| 作者 | 柳祝平 |
| 学位类别 | 博士 |
| 答辩日期 | 2003 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 姜中宏 |
| 关键词 | Cr~(3+)共掺 磷酸盐饵玻璃 光谱性质 激光器 |
| 其他题名 | Spectroscopic and Laser Properties of Er~(3+)-doped Phosphate Glasses |
| 中文摘要 | 固体激光器的小型化、集成化发展趋势以及现代光通信对单纵模激光的需求推动了微片激光器的发展。为了在较短的激光介质中获得足够高的增益，微片激光器的基质材料必须是高浓度稀土离子掺杂。然而高浓度掺杂往往会引起强烈的浓度碎灭，也容易引起玻璃失透，这是目前影响玻璃基微片激光器发展的两个主要障碍。因此寻求低浓度碎灭的高浓度稀土离子掺杂的玻璃系统是目前发展玻璃基微片激光器激光材料的一个重要课题。另一方面，用于军事方面测距的掺饵玻璃调Q激光器目前在我国还没有成熟的产品，开发具有自主知识产权的相关玻璃介质也是一个非常紧迫的任务。本论文主要是围绕研究掺饵磷酸盐玻璃玻璃的光谱性质和激光性质，希望通过玻璃组分的优化，制备工艺的改进，实现饵玻璃光谱性质和激光性能的优化。本文首先在引言中概括了掺饵磷酸盐玻璃的研究目的和意义，随后在文献综述中简单地介绍了几种常用的稀土掺杂激光玻璃研究进展。同时重点介绍了国内外闪光灯泵浦的微型军用饵玻璃测距激光器和LD泵浦的玻璃微片激光器研究进展，在此基础上确定了本文的研究思路。在论文的第二章，介绍了实验方法和激光玻璃的基础理论，包括玻璃的制备，各种性质的测试手段以及光谱理论计算和激光理论等。论文第三章重点研究了用于LD泵浦的Yb~(3+)、Er~(3+)共掺磷酸盐玻璃的光谱性质。探讨了玻璃中 Yb~(3+)离子浓度，碱金属氧化物R_2O（R＝Li，Na，K），碱土金属氧化物MO（M＝Mg，Ca，Ba，Zn），以及玻璃形成体P2O5的含量对玻璃中饵离子光谱性质的影响。研究发现，碱金属氧化物以加K2O效果最好。在成玻璃范围内，网络生成体P_2O_5含量的增加能提高Yb~(3+)离子的吸收截面和Er~(3+)离子的受激发射截面，饵 玻璃中P2O5的含量在60-65mol％较合适。敏化剂Yb_2O_3的浓度要适当，Yb_2O_3含量过高易引起浓度淬灭，并降低Er~(3+)离子受激发射截面和荧光寿命，Yb_2O_3含量过低时又会引起从Yb~(3+)离子到Er~(3+)离子的能量转移效率的下降。荧光寿命不仅受玻璃组成的影响，还与玻璃中OH-含量密切相关。OH~-对磷酸盐饵玻璃的激光和光谱性质有很大的影响。由于H刃在近红外区域吸收峰的二次谐波正好与饵离子的发光波长重合，因此，OH~-的存在对Er~(3+)的荧光有很强的碎灭作用。通过改进工艺，可以较好地去除玻璃中的OH~-基。第三章的第二节对此进行了较详细地研究。在第三章的第三节研究了含较高Er~(3+)离子浓度（1.55×10~(20)cm~(-3)）的Yb~(3+)、Er~(3+)共掺磷酸盐玻璃在不同敏化剂Yb~(3+)离子浓度和Al_2O_3含量的条件下Er~(3+)离子光谱性质的变化规律，通过测得的吸收光谱计算了Er~(3+)在磷酸盐玻璃中的J-O。参量，并由此计算得到Er~(3+)离子在磷酸盐玻璃中的光谱参数。对不同敏化剂Yb~(3+)离子浓度和Al_2O_3。含量的玻璃光谱性质的差异进行了解释。同时测定该玻璃的荧光上转换特性，探明其上转换机理和敏化剂Yb~(3+)含量对上转换荧光的影响。第四章对经过成分优化和工艺改良后研制成功的Yb~(3+)、Er~(3+)共掺磷酸盐玻璃激光性质进行了研究。用974nm的半导体激光器作为泵浦源成功地在室温下实现了臆饵共掺磷酸盐饵玻璃1.53μm的连续激光输出。对0.13wt％，0.5wt％和1.0wt％三种Er_2O_3名义掺杂浓度和1mm、2mm、3mm不同厚度样品的激光实验结果表明，在Er2O3名义掺杂浓度为0.5wt％，样品厚度为2mm时，玻璃的综合激光性质最好，它的激光闭值功率为118mw，最大输出功率为43mW，斜率效率为10.6％。第五章主要对Cr~(3+)、Yb~(3+)、Er~(3+)共掺磷酸盐饵玻璃的光谱性质和激光性质进行了研究。由于这种类型的玻璃主要在军事方面具有重要用途，因此关于其材料的研究报道较少。本章的第一节我们在Yb~(3+)、共掺磷酸盐玻璃基质成分的基础上，研究了Ce~(3+)和Cr~(3+)对Er~(3+)离子发光性能的影响。研究结果表明，Ce~(3+)和Cr~(3+)离子的含量太低会导致玻璃对氨灯泵浦能量吸收不够充分，但Ce~(3+)离子含量太高会使Ce~(3+)离子的自吸收加剧，导致浓度粹灭；而Cr3+离子浓度低时能量传递效率低，浓度太高会导致玻璃过热，影响激光性能和玻璃的实用寿命[11]。本论文研究结果显示，CeO_2含量为2.8mol％，Cr_2O_3含量为0.08wt％玻璃光谱性质较好。此外，Ce~(3+)离子价态的变化也对玻璃的光谱性质有重要影响。Ce~(3+)离子的存在更有利于对泵浦光的吸收和能量的传递。因此，在通气除水过程中，必须要控制通气气氛和时间。本章的第二节研究了成分优化后Cr~(3+)、Yb~(3+)、Er~(3+)共掺磷酸盐玻璃的激光性质。用闪光灯作为泵浦源成功地在室温下实现了铬臆饵共掺磷酸盐饵玻璃1.53μm的转镜调O激光输出。三种Er2O3掺杂浓度的激光实验结果表明，在Er2O3名义掺杂浓度为O.5wt％时，玻璃的综合激光性质最好，它的激光阂值能量为14.5J，最大输出能量为7.8mJ，斜率效率为0.55％。最后是本论文的结论部分，概括了全文的实验研究结果，同时指出了存在的不足及需要补充改进之处。 |
| 英文摘要 | The Erbium-doped glass microchip laser is very attractive due to its emission wavelength located in the eye-safe region, in the optical telecommunication and range founder. For microchip laser application, the rare earth ion concentration in the host glasses must be as high as possible to ensure sufficient gain despite short active length. However, the appearance of concentration quenching and devitrification at high RE concentrations in most glass systems has been the major obstacle in this area. In this thesis, the work is focused on the spectroscopic and laser properties of erbium doped phosphate glass. The compositins of glass is optimized and the technique is improved in order to achieve the optimal spectroscopic and laser properties. The purpose and significance on investigation of erbium doped phosphate glass are stressed in the introduction part. Following is the description of laser theory foundation of RE doped materials, the development trend of laser glasses and LD pumped microchip laser in chapter one, the idea of this dissertation is presented. In second chapter the experiment methods and basic theories of laser glass are introduced, including the glass preparation procedures, spectroscopic property measurements, spectroscopic theory and laser theory. In chapter three, the spectroscopic properties of LD-pumped Yb,Er-codoped phosphate glasses were investigated. The effect of Yb_2O_3 and P_2O_5 concentrations, alkali metal oxides, alkaline earth metal oxides on spectroscopic properties of erbium ions was discussed. It was found that the K_2O is the most effective oxide to improveσ_(abs)(Yb) andσ_(emi)(Er). The effect of OH" on fluorescence lifetime of erbium doped phosphate glasses was studied in the second section. The presence of OH" introduces a series of absorption bands throughout the NIR spectrum. It is a very harmful quencher in Er~(3+) glasses. OH~- groups in glass can be removed by proper melting techqinue. In the third section of chapter three, the effect of Yb2O3 and Al_2O_3 on the spectroscopic properties and up-conversion of the highly Er-doped phosphate glasses was studied. The J-O parameters of erbium phosphate glasses have been calculated from the measured absorption spectra. The oscillator strength, spontaneous emission probability, quantum efficiency and up-conversion coefficient of Er3+ have been calculated from the measured fluorescent lifetime and the calculated J-0 parameters. The laser properties of Yb3+, Er3+-codoped phosphate glasses have been studies in chapter four. Continuous laser at 1.53um was obtained at room temperature in this erbium glass pumped by 974nm, 2W laser diode. The effect of Er2O3 concentration and sample thickness on laser properties was investigated. It was found the laser threshold and slope efficiency is strongly dependent on sample thichness and Er3+ ion concentrations. At the same Er~(3+) ion concentration, the thicker the sample, the larger the laser threshold. Slope efficiency increases with the Er ionconcentration at the same sample thickness. At present the best laser properties are realized in glass with 0.5wt% Er2O3 concentration and 2mm thickness glass sample. In this glass 10.6% slope efficiency, 118mW laser threshold and 43mW maximum laser output were obtained. In the chapter five, the spectroscopy and laser properties of Cr~(3+), Yb~(3+),Er~(3+) co-doped phosphate glasses was studied. It was less reported about this laser glass for the reason that it was used in military field. In the first section,the effect of Ce~(3+) and Cr~(3+) on the spectroscopy properties of Cr~(3+), Yb~(3+),Er~(3+) co-doped phosphate glasses was studied. It was found that the glass displays a better spectroscopy property when the content of CeO2 is 2.8mol% and that of Cr_2O_3 is 0.08wt%. In addition, the atmosphere and time of bubbling must be controlled. In the second section, the laser properties of Cr~(3+), Yb~(3+),Er~(3+) co-doped phosphate glasses was studied. Rotating prism Q-switched laser at 1.53μm was obtained at room temperature in this erbium glass pumped by flash lamp. The best laser properties are realized in glass with 0.5wt% Er_2O_3 concentration. The properties include 14.5J threshold energy, 7.8mJ maximum laser output and 0.55% slope efficiency. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15407]  |
| 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 | 柳祝平. 掺饵磷酸盐玻璃光谱性质与激光性质研究[D]. 中国科学院上海光学精密机械研究所. 2003. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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