镱铒共掺硅酸钆激光晶体的生长和性能研究
文献类型：学位论文
| 作者 | 徐文伟 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 周国清 |
| 关键词 | Yb Er:Gd2SiO5 激光晶体 1.5µ m波段激光 晶体生长 |
| 其他题名 | Study on growth and properties of ytterbium, erbium codoped gadolinium orthosilicate laser crystal |
| 中文摘要 | 1.5µm波段激光在医学，光通信，激光测距等方面具有极其广泛的应用价值。在各种获得1.5µm波段激光的方法中，利用掺Yb3+和Er3+的激光晶体已成为人们的研究热点。稀土正硅酸盐系列Re2SiO5晶体（其中Re＝Lu、Y、Gd）因其优异的光学和物化性能，独特的低对称性单斜晶体结构，稀土离子扭曲的低对称双格位特性，为掺杂离子提供了较强的晶体场和配位场，有利于掺杂离子产生大的Stark能级分裂，是低阈值高功率1.5µm固体激光的理想基质。 本文系统研究了Yb,Er:Gd2SiO5 (Yb,Er:GSO) 激光晶体的生长、结构特性和光学性能，主要结论如下： 采用提拉法生长了不同浓度的Yb,Er:GSO晶体，通过优化生长工艺，得到透明、高光质量、完整不开裂、无宏观缺陷的晶体。 通过XRD分析并计算了Yb,Er:GSO晶体的晶胞参数，确定它们的晶体结构，研究掺杂离子的浓度对其晶胞结构和参数的影响。 研究了Yb,Er:GSO晶体在室温下的吸收、发射光谱和荧光寿命，我们发现Yb,Er:GSO晶体具有大的吸收截面和吸收带宽，能与InGaAs LD抽运有效耦合，而且降低了对LD泵浦源温度控制的要求，容易实现激光振荡。测量了Yb,Er:GSO晶体在室温下940nmLD泵浦时的上转换荧光光谱，确定由4II5/2到2HI1/2和4S3/2跃迁过程的双光子机理。通过计算Yb, Er: GSO晶体中的Yb3+,与Er3+之间的能量传递参数和有效能量传递效率可知，在Yb,Er:GSO晶体中Yb3+到Er3+的能量传递参数比Er3+到Yb3+的能量反传递参数要高一个数量级，其有效能量传递效率比目前已知的Yb,Er:LiNO3要高得多，表明在该晶体中，Yb3+能够很好的充当敏化剂的作用。通过计算光谱参数预测Yb,Er:GSO晶体有望实现在1.5µm附近的低阈值、高效率的激光输出。 |
| 英文摘要 | 1.5µm laser is promising in applications such as medicine, optic communication, and laser distance measuring. Among various methods obtaining 1.5µm laser, laser crystals codoped by Yb3+ and Er3+ have been hot research topics. Because of their good optical quality, excellent physical and chemical properties, low-symmetry crystal structure and multi-type of distorted substitutional sites, rare earth doped oxyorthosilicate, Re2SiO5 (Re= Lu3+, Y3+, Gd3+), provide a strong local crystal-field and ligand field, which is favorable for a large stark splitting of the dopants, and thus act as a ideal host for 1.5µm solid state laser crystals with low threshold and high power. In this thesis, several aspects of Yb-Er codoped Gd2SiO5, including crystal growth, structural and optical properties, were systematically studied. Several conclusions were reached: Yb, Er: GSO single crystal with different amounts of dopants were grown by Czochralski method, by optimizing the growth process, transparent high optical quality crystals devoid of macroscopic defects and cleavage were obtained. Crystal structures and cell parameters of GSO codoped with Yb and Er were analyzed and determined by X-ray Powder Diffraction; influence of dopants concentration on crystal structure and cell parameters was studied. Absorption and emission spectrum, as well as fluorescence decay curve of dopants, were studied at room temperature; the result indicates that Yb, Er: GSO was characterized with large absorption cross section and broad absorption band, which match well with the emission wavelength of efficient diode-pumping using high performance InGaAs laser diodes. The crystal also decreases requirements for temperature control over LD pumping source and facilitates laser oscillation. The room temperature upconversion luminescence pumped by 940nm LD was studied and two-photon mechanism associated with transition 4II5/2→2HI1/2 and 4II5/2→4S3/2 was confirmed. The calculation of energy transfer coefficients and effective energy transfer efficiency in Yb, Er codoped Gd2SiO5 gave the result that energy transfer coefficient of Yb3+→Er3+ is abut one order larger than that of Er3+→Yb3+, the effective energy transfer efficiency is much higher than that in Yb, Er: LiNO3 and consolidated the fact that Yb3+ can be used as effective sensitizer. By calculating spectroscopic parameters of Yb, Er: GSO laser crystals, we can expect output of 1.5-µm laser with lower threshold and high power in this crystal. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16648]  |
| 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 | 徐文伟. 镱铒共掺硅酸钆激光晶体的生长和性能研究[D]. 中国科学院上海光学精密机械研究所. 2007. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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