Re(Er,Yb,Tm)/Mg共掺LiNbO3晶体生长及其性能研究
文献类型：学位论文
| 作者 | 张沛雄 |
| 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 | 杭寅 |
| 关键词 | 铌酸锂晶体 提拉法 光学性能 激光晶体 |
| 其他题名 | Studies on the growth and properties of LiNbO3 Crystals co-doped with Re(Er,Yb,Tm) and Mg |
| 中文摘要 | 铌酸锂（LiNbO3，简称LN）晶体作为性能优良的多功能晶体，被广泛地应用于声表面波、电光、声光、集成电子、信息存储等方面。在众多的晶体材料中，LiNbO3晶体仍然为最容易实现高质量、大尺寸、光学级别生长的少有几种晶体之一，同时，LiNbO3晶体自身具有可以调节的Li/Nb比率，这为进行高浓度掺杂提供了有利条件。随着准相位匹配技术的发展，在铌酸锂晶体中掺杂稀土离子以实现激光自倍频输出，是铌酸锂晶体的重要发展方向之一。另外，掺杂Mg可以提高铌酸锂晶体质量，尤其在光损伤方面能大幅提高晶体的抗损伤能力。本文将Mg与稀土离子共掺，旨在获得高质量自倍频激光晶体。 本文主要内容包括以下几个方面： (1)研究了提拉法生长Er/Yb/Mg:LN 晶体的工艺过程，包括配制原料、混料、烧料、晶体生长、极化等工艺参数，并成功生长出了Er/Yb/Mg:LN、Er/Mg:LN、Er/Yb:LN、Er:LN和Tm/Mg:LN晶体。 (2)使用X-射线粉末衍射实验对Er/Yb/Mg:LN系列晶体和Tm/Mg:LN晶体进行分析，结果表明晶体结晶度非常好，掺杂并没有改变晶体的结构。 (3)使用红外透射谱对Er/Yb/Mg:LN系列晶体进行了分析，结果表明晶体的OH-的振动峰都在3484 cm-1附近，并没有紫移到3534 cm-1左右，说明晶体中Mg2+的掺杂浓度还没有达到阈值浓度。另一方面，我们也发现，Mg2+离子的掺入使OH-的振动峰发生微小的红移，而Yb3+离子的掺入使OH-的振动峰发生微小的紫移。 (4)使用拉曼光谱对Er/Yb/Mg:LN系列晶体进行了分析，结果表明Er,Yb,Mg:LiNbO3，Er, Mg:LiNbO3，Er,Yb:LiNbO3晶体的峰位以及强度都很接近，但是未掺Mg2+离子和Yb3+离子的Er:LiNbO3晶体在峰强方面与其他晶体有明显的不同，随着Mg2+离子和Yb3+离子的掺入，600 cm-1峰位处的峰强大大降低，而870 cm-1峰位处的峰强却大大增强了，表明了Mg2+离子和Yb3+离子的掺入使得晶体将有更多的声子能量积聚于最大声子能量处。 (5)对Er/Yb/Mg:LN系列晶体和Tm/Mg:LN晶体的吸收谱、荧光谱、荧光寿命等进行了测试与分析，进行了光谱参数计算，并评估了 LN 晶体作为激光基质以及在激光自倍频方面的应用前景。 (6)对Tm/Mg:LN晶体进行了激光实验，对于3%的耦合镜，当激光二极管泵浦功率为12.7 W时，Tm,Mg:LiNbO3晶体获得的最大激光输出功率为1.026 W，是目前报道的Tm:LiNbO3晶体1885 nm激光的最高输出功率，得到斜率效率为14%。对于5%的耦合镜，当激光二极管泵浦功率为12.7 W时，Tm,Mg:LiNbO3晶体获得的最大激光输出功率为0.864 W，得到斜率效率为13%。 |
| 英文摘要 | As the excellent performance in multi-function, Lithium Niobate (LiNbO3, LN) has been used in surface acoustic wave, electro-optic, acousto-optic, integrated electronic, holographic storage and so on. LN is one of the few several kinds of crystals, which can be grown easily with high quality, large size, and optical level. At the same time, LN has the ability to adjust the ration between Li and Nb, which provides favorable conditions for high concentration of doping. Along with the development in quasi-phase matching method, the LN crystal has been the potential self-frequency-doubled generation laser host with doped rare earth. This is one of the most important research development directions for LN crystals. Studies show that Mg-doped LN crystals can significantly improve their performance in photo damage aspects. In this paper, Er/Yb/Mg:LN crystals and Tm/Mg:LN crystal were successfully grown by Czochralski method. Their structures and properties were studied by a variety of methods. The research work is summarized as the following: (1)The growth process of Er/Yb/Mg:LN crystals and Tm/Mg:LN crystal were detailed researched, including raw matetial preparation, crystal growth and poling process. (2)XRD results indicated a very good crystallization of the crystals. The doped ions in the crystals lead to a little change in lattice parameters, but the crystals still remain their own structure. (3)Infrared absorption spectra of Er/Yb/Mg:LN crystals were measured. Only one absorption peak is seen near at 3484 cm-1, indicating that Mg concentration in the as-grown crystal is below the optical damage threshold concentration point. The result also indicated that with the doping of Mg, the peak in 3484 cm-1 appeared a slight red shift, but with the doping of Yb, the peak in 3484 cm-1 appeared a slight blue shift. (4)Micro-Raman spectra of Er/Yb/Mg:LN crystals were also measured. It is clear that as Mg2+ ions are incorporated into Er:LN crystal, the intensity of the highest point at 870 cm-1 strengthen, but the intensity at 670 cm-1 weaken. The enhanced highest phonon energy (870 cm-1) in Er/Yb/Mg:LN crystal could lead to a fast 4I11/2→4I13/2 transition of Er3+ ion. (5)The absorption spectra, fluoeresence spectra and lifetime of Er/Yb/Mg:LN crystals and Tm/Mg:LN crystal were measured, and the optical parameters of Er3+ were calculated by J-O theory. Furthermore, we assessed the LN crystal’s potential applications in self-frequency-doubled laser hosts and devices. (6) Non-photorefractive continuous wave laser operation with a Tm/Mg:LN single crystal is demonstrated at room temperature for the first time. We obtained 1.026 W output power at 1885 nm with a slope efficiency of near 14%, which, to the best ofour knowledge, are the largest output power and highest slope efficiency obtained for this crystal thus far. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16798]  |
| 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 | 张沛雄. Re(Er,Yb,Tm)/Mg共掺LiNbO3晶体生长及其性能研究[D]. 中国科学院上海光学精密机械研究所. 2013. |
入库方式： OAI收割
来源：上海光学精密机械研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。