Preparation of Room Temperature Persistent Spectral Hole Burning Glasses

Eu^&lt；3&gt；和Sm^&lt；2&gt；离子的持久光谱烧孔(PSHB)现象是高密度频域光学数据存储中最重要的光学特性之一。在实际使用中，需要高温PSHB和稳定的孔洞。作为主体材料，玻璃被认为比晶体更有利，因为它的宽度宽而不均匀，成分多样，易于大规模生产。重点研究了用溶胶-凝胶法制备高温PSHB玻璃，并成功地制备了掺杂Sm^&lt；2&gt；和Eu^&lt；3&gt；离子的铝硅酸盐玻璃，其PSHB温度分别高达300K和210K。(1)通过加热稀土硝酸盐和金属醇盐合成的凝胶制备了Sm^&lt；2&gt；和Eu^&lt；3&gt；掺杂二氧化硅和铝硅酸盐玻璃。(2)在Eu^&lt；3&gt；和Sm^&lt；2&gt；离子的^7F_0*5D_0跃迁的激发光谱上观察到了PSHB。随着羟键含量的增加，空穴深度成比例增加。(3)PSHB是由Sm^&lt；2&gt；离子的光致重排和光电离形成的，Sm^&lt；2&gt；和Eu^&lt；3&gt；离子周围的OH键重排烧毁的空穴和OH键重排烧毁的空穴被热重新填充。

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