黄光激光位于人眼敏感波段，在生物医学、激光显示和军事等领域具有重要的应用。通过对LD泵浦的晶体进行倍频已获得红、绿、蓝等可见光波段的激光输出，唯独黄光激光因缺少相应的基频光而无法倍频直接实现。本项目拟采用蓝光LD抽运Dy:Ln2O3-Al2O3晶体直接实现黄光激光。该体系具有介电常数大、带隙宽、热导率高、声子能量低等优点，而且大多同成分熔化，采用微下拉法或提拉法较易获得优质晶体。首先，基于该二元体系构建4f轨道杂化模型进行结构选型和组成设计，然后采用微下拉法高通量制备晶体光纤，研究其结构、缺陷、物化和光谱性能等，重点是研究晶体结构与性能之间的关系，并共掺其它敏化离子进行能级耦合的理论及实验研究，进行量子剪裁，调制黄光峰值波长，提高发光量子效率。接着从中筛选优化出2~3种合适的晶体类型，采用提拉法生长出大尺寸高质量晶体。最后设计激光腔和膜系参数，利用LD泵浦直接实现高效、稳定的黄光激光输出。

Yellow laser is located in the sensitive band of human eyes, which has found many important potential applications in the fields of biomedicine, laser display and military etc. The visible lasers such as red, green and blue lasers have been achieved through LD pumping and double-frequency techniques, but only yellow lasers can't be realized directly by these methods owing to lack of relative fundamental frequency light. Therefore, we bring forward to Dy3+ activated Ln2O3-Al2O3 binary system crystals to achieve all-solid yellow laser under blue LD pumping directly. This binary system owns the following advantages: high dielectric coefficient, broad band gap, high thermal conductivity, and low maximum phonon energy, etc. Furthermore, bulk single crystals of them are relatively easy to obtain by the micro-pulling-down method and the Czochralski technique because most of the binary system crystals melt congruently. .In this project, firstly, 4f orbital hybridization model is built on the basis of Dy3+ activated Ln2O3-Al2O3 binary system, the crystal structure and elements are designed and the high-throughput crystal growth by using the micro-pulling-down method is carried out, and then their structure and defects analyses, physicochemical and spectral properties characterization are presented. The emphasis is to study on the relationship between the crystal structures and characterizations, and present the theoretical and experimental researches on the energy levels outcoupling by co-doping with other kinds of sensitization ions, and thus regulate the emission peaks and improve the fluorescence quantum efficiency within the yellow emission bands. Next, 2~3 kinds of appropriate crystals are screened and optimized, and the large-sized crystals with high optical quality are obtained by the Czochralski technique. Finally, laser cavity and the coating film parameters are designed and the stable yellow laser with high efficiency is achieved under LD pumping, and further providing foundation for their reality applications.