The study on mutiphoton absorption induced photorefractive effect and fixing process

多光子吸收诱导光折变效应及定影工艺研究

• 批准号: 08650050
• 负责人: KAWATA Yoshimasa
• 金额: $ 1.41万
• 依托单位: SHIZUOKA UNIVERSITY (1997)Osaka University (1996)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650050/
• 关键词: photorefractive crystal; two-photon absorption; fixing; optical memory; hologram memory; ferroelectrics; three-dimensional optics; optical microscopy; フォトリフラクティブ効果; 多光子誘起過程; ホログラフィ

Multiphoton induced photorefractive effect and thermal fixing process of the refractive index distribution in a photorefractive crystal had been inverstigated. The summaries in this research results are followings.1. Thermal fixing process was investigated with a LiNbO_3 crystal. It was succeeded in continuous reading the hologram more than six hours without any degradation of the recorded data.2. The bit data recorded with a focused beam in the crystal were also fixed.3. Two-photon absorption process in a non-doped LiNbO_3 crystal was inveratigated. A titanium sapphire laser was used for a light source. The induced refractive index distribution was observed wiht a phase-contrast microscope. It was very verified that photorefractive effect was induced with two-photon absorption process.4. As an application of two-photon process in a photorefractive crystal, multilayred optical memory was demonstrated. Seven layrs recording and reading with little crosstalk was presented. The distance between neighboring bits was 4 mum and neighboring layrs was 20 mum.

研究了光折变晶体中多光子诱导的光折变效应和折射率分布的热固定过程。本研究的主要成果如下：1.本文研究了LiNbO_3晶体的热固定过程。它成功地连续阅读全息图超过六个小时，没有任何退化的记录数据。用聚焦光束记录在晶体中的位数据也是固定的。研究了非掺杂LiNbO_3晶体的双光子吸收过程。使用钛蓝宝石激光器作为光源。用相差显微镜观察了诱导折射率分布。实验结果证实了光折变效应是由双光子吸收过程引起的.作为双光子过程在光折变晶体中的一个应用，提出了多层膜光存储器。提出了一种串扰小的七层记录和阅读方法。相邻位之间的距离为4 μ m，相邻层之间的距离为20 μ m。

项目成果

H.Ueki: "Three-dimensional optical bit-memory recording and reading with a phtorefractive crystal : analysis and experiment" Applied Optics. 35. 2457-2465 (1996)

H.Ueki：“用光折射晶体进行三维光学位存储器记录和读取：分析和实验”应用光学。

H.Ueki: "Three-dimensional optical bit-memory recording and reading with a photorefractive crystal:analysis and experiment" Applied Optics. 35. 2457-2465 (1996)

H.Ueki：“用光折变晶体进行三维光学位存储器记录和读取：分析和实验”应用光学。

Y.Kawata: "Differential phase-contrast microscope with a split detector for the readout system of a multilayred optical memory" Applied Optics. 35. 2466-2470 (1996)

Y.Kawata：“用于多层光学存储器读出系统的具有分裂检测器的差动相差显微镜”应用光学。

Y.Kawata: "Randomly accessable multilayered optical memory using Bi_<12>SiO_<20> crystal" Applied Optics. 35. 5308-5311 (1996)

Y.Kawata：“使用 Bi_<12>SiO_<20> 晶体的随机存取多层光学存储器”应用光学。

O.Nakamura: "Double-Pass Confocal Absorption Microscope with a Phase Conjugation Mirror" Jpn.J.Appl.Phys.35. L852-L853 (1996)

O.Nakamura：“带有相位共轭镜的双通共焦吸收显微镜”Jpn.J.Appl.Phys.35。