常温ホールバーニングを利用した広波長域型光メモリーガラスの創製

利用室温烧孔技术制造宽波长范围光学记忆玻璃

• 批准号: 13305048
• 负责人: NOGAMI Masayuki
• 金额: $ 33.95万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13305048/
• 关键词: Hole burning; Glass; Rare earth; Memory; Sol-gel; スペクトルホールバーニング; PSHB; ゾルゲル法; Smイオン; アルミノシリケートガラス; X線照射; 光ブリーチング; 常温; ガラス欠陥

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. In this work, we studied the preparation of PSHB glasses doped with Eu^<3+> and Sm^<2+> ions using a sol-gel method and the PSHB properties of these glasses treated with different conditions. The conclusions of our research are summarized as follows ;(1) PSHB was observed on the excitation spectra of the ^7F_0→^5D_0 transition of the Eu^<3+> and Sm^<2+> ions-deped glasses.(2) The efficiency of hole-burning, burned at low temperature 〜77K, was proportionally increased with the content of OH groups surrounding the rare-earth ions. The proposed mechanism for hole-burn … More ing was the optically activated rearrangement of the OH bonds surrounding the rare-earth ions. The burned-hole was thermally refilled and erased above 〜200K.(3) The glasses obtained by heating in H_2 gas showed PSHB up to room temperature. When heated in H_2 gas, the H_2 molecules react with oxygen ions to form H_2O. Removal of the generated H_2O causes the number of oxygen ions surrounding rare-earth ions to decrease, resulting into the reduction of the ions. The hole burning in the H_2-treated, glasses was performed by the electron transfer between the rare-earth ions and the trapping centers.(4) The glasses which were irradiated with x-ray also showed room temperature PSHB. It was found that the rare-earth ions are reduced into the divalent state by electron transfer from the oxygen defect center. The hole defect centers are trapped in oxygen ions bound with Al^<3+> ions. The spectral hole burning of the x-ray irradiated glasses could be burned by the reverse reaction of the reduction of the rare-earth ions. A short distance between the Sm^<2+> and oxygen defect centers brought a high-speed hole burning, that is, 30 times faster than in a similar H_2 gas treated glass. This fast formation of PSHB was contributed to the formation of the Sm^<2+> and hole center in oxygen ions.(5) PSHB was also observed in the femtosecond laser-irradiated Sm^<2+> ions-doped Al_2O_3-SiO_2 glasses. The hole-burning efficiency was superior to that of Sm^<2+> ions in the H_2-treated glasses and comparable to that in x-ray irradiated glasses. prepared by the sol-gel method.(6) Two different mechanisms were proposed for the PSHB in the Sm^<2+>-doped Al_2O_3-SiO_2 glasses. In the H_2-gas treated glass, the Sm^<2+> ions are stable to bond with the defect free oxygen ions. PSHB is formed by the ionization of the Sm^<2+> and the capture of the released-electron in the Sm^<3+> ions. On the other hand, in the x-ray or laser irradiated glass, the electrons excited from the Sm^<2+> are trapped in the hole-centers in the neighboring oxygen. A short distance between the Sm^<2+> and the oxygen defect center makes fast hole formation. These fast and high efficient hole burning glass become possible to realize high density memory. Less

Eu^<3+>和Sm^<2+>离子的持续光谱烧孔（PSHB）现象是高密度频域光数据存储器中最重要的光学特性之一。在实际应用中，需要高温PSHB和稳定的孔。作为主体材料，玻璃被认为比晶体更有利，因为其宽的非均质宽度，成分的多样性和易于批量生产。本文采用溶胶-凝胶法制备了Eu^<3+>和Sm^<2+>离子掺杂的PSHB玻璃，并研究了不同处理条件下PSHB玻璃的PSHB性能。本文的研究结论总结如下：(1)在Eu^<3+>和Sm^<2+>离子沉积玻璃的^7F_0→^5D_0跃迁激发光谱上观察到PSHB。(2)在低温~ 77K条件下，随着稀土离子周围OH基团含量的增加，烧孔效率成比例地提高。提出的空穴燃烧机制更多的是围绕稀土离子的氢氧根键的光学激活重排。在~ 200K以上对烧孔进行热填充和擦除。(3)在H_2气体中加热得到的玻璃在室温下均表现出PSHB。当在H_2气体中加热时，H_2分子与氧离子反应生成H_2O。除去生成的H_2O，使稀土离子周围的氧离子数量减少，导致稀土离子的还原。h_2处理玻璃的空穴燃烧是通过稀土离子与俘获中心之间的电子转移来实现的。(4)经x射线辐照的玻璃也出现室温PSHB。发现稀土离子通过氧缺陷中心的电子转移被还原为二价态。空穴缺陷中心被困在与Al^<3+>离子结合的氧离子中。x射线辐照玻璃的光谱空穴燃烧是由稀土离子还原的逆反应引起的。Sm^<2+>和氧缺陷中心之间的距离较短，导致了高速的孔燃烧，比类似的H_2气体处理玻璃快30倍。PSHB的快速形成与氧离子中Sm^<2+>和空穴中心的形成有关。(5)在飞秒激光辐照Sm^<2+>离子掺杂的Al_2O_3-SiO_2玻璃中也观察到PSHB。在h_2处理的玻璃中，其空穴燃烧效率优于Sm^<2+>离子，与x射线辐照玻璃的空穴燃烧效率相当。溶胶-凝胶法制备。(6)在Sm^<2+>掺杂的Al_2O_3-SiO_2玻璃中，提出了两种不同的PSHB机制。在h_2 -气体处理的玻璃中，Sm^<2+>离子稳定地与缺陷氧离子结合。PSHB是由Sm^<2+>的电离和Sm^<3+>离子中释放的电子的捕获形成的。另一方面，在x射线或激光照射的玻璃中，从Sm^<2+>激发的电子被困在邻近氧的空穴中心。Sm^<2+>与氧缺陷中心之间的距离较短，使得空穴形成速度较快。这些快速、高效的烧孔玻璃使实现高密度存储成为可能。少

项目成果

Masayuki Nogami: "Energy migration of the local excitation at the Eu^<3+> site in a Eu-O chemical cluster in sol-gel derived SiO_2:Eu^<3+> glasses"J.Non-cryst.Solids. 90. 2200-2205 (2001)

Masayuki Nogami：“溶胶-凝胶衍生的 SiO_2:Eu^<3> 玻璃中 Eu-O 化学簇中 Eu^<3> 位点局部激发的能量迁移”J.Non-cryst.Solids。

Masayuki Nogami: "Laser induced SnO_2 crystallization and fluorescence properties in Eu^<3+> doped-SnO_2-SiO_2 glasses"Phys.Rev.B. 68. (2003)

Masayuki Nogami：“激光诱导SnO_2结晶和Eu^3>掺杂-SnO_2-SiO_2玻璃中的荧光特性”Phys.Rev.B。

Masayuki Nogami: "Room-temperature persistent spectral hole burning of Eu^<3+> coupling with Al^<3+> in glass"Phys. Rev., B. 63. 104205-1-6 (2001)

Masayuki Nogami：“玻璃中 Eu^<3> 与 Al^<3> 耦合的室温持续光谱烧孔”Phys。

Masayuki Nogami: "Room-temperature hole-burning and sublinear hole-growth dynamics in an Sm^<2+>-doped aluminosilicate glass"J.Non.Cryst.Solids. 297. 113-119 (2002)

Masayuki Nogami：“Sm^2 掺杂铝硅酸盐玻璃中的室温烧孔和亚线性空穴生长动力学”J.Non.Cryst.Solids。

Masayuki Nogami, Tomotatsu Hayakawa: "Optical nonlinearity of glass containing nano-particle CdS and SnO_2 : Eu^<3+>"Int.J.Mater.Prod.Technol.. 18. 283-295 (2003)

Masayuki Nogami、Tomotatsu Hayakawa：“含有纳米颗粒 CdS 和 SnO_2 的玻璃的光学非线性：Eu^<3 >”Int.J.Mater.Prod.Technol.. 18. 283-295 (2003)