Preparation of Room Temperature Persistent Spectral Hole Burning Glasses

Eu^3+和Sm^2+离子的持续光谱烧孔（PSHB）现象是用于高密度频域光数据存储的最重要的光学性质之一。在实际应用中，需要高温PSHB和稳定的孔。作为基质材料，玻璃被认为比晶体更有利，因为它们具有宽的不均匀宽度、成分多样性和易于大规模生产。我们采用溶胶-凝胶法制备了高温PSHB玻璃，并成功地制备了Sm^2+和Eu^3+掺杂的铝硅酸盐玻璃，其PSHB温度分别达到300 K和210 K。主要研究结果如下：（1）采用稀土金属醇盐和硝酸盐合成凝胶，通过加热制备了Sm^<2+>和Eu^<3+>掺杂的硅铝玻璃。(2)在Eu^<3+>和Sm^<2+>离子的^7F_0*^5D_0跃迁的激发光谱上观察到PSHB。随着羟基键含量的增加，空穴深度成比例地增加。(3)PSHB是由Sm ^<2+>离子的光致OH键重排和光致电离共同作用形成的，Sm^<2+>和Eu^<3+>离子周围的OH键重排烧蚀的空穴和OH键重排烧蚀的空穴被热填充

Persistent spectral hole burning (PSHB) phenomenon of Eu^<3+> and Sm^<2+> ions is one of the most significant optical properties for use in high-density frequency-domain optical data memory. For practical use, high temperature PSHB and stable hole are required. As a host material, glasses are thought to be more favorable than crystals, because of their wide inhomogeneous width, compositional variety and easy mass production. We focused on the preparation of high temperature PSHB glasses using a sol-gel method and succeeded in preparing aluminosilicate glasses doped with Sm^<2+> and Eu^<3+> ions exhibiting PSHB up to 300 and 210 K, respectively. The conclusions of our research are summarized as follows ;(1) Sm^<2+> and Eu^<3+>-doped silica and aluminosilicate glasses were prepared by heating the gels synthesized from metal alkoxides and nitrates of rare-earth.(2) PSHB was observed on the excitation spectra of the ^7F_0*^5D_0transition of the Eu^<3+> and Sm^<2+> ions. The hole depth proportionally increased as the content of hydroxyl bonds increased.(3) PSHB was formed by both the photo-induced rearrangement of the OH bonds and the photoionization of Sm^<2+> ions, and the holes burned by the rearrangement of the OH bonds surrounding the Sm^<2+> and Eu^<3+> ions and the holes burned by the rearrangement of the OH bonds were thermally refilled