Stabilization of solid state laser oscillation by coexistence of rare earth ions and color centers

稀土离子和色心共存稳定固态激光振荡

基本信息

批准号：
12650056
负责人：
TSUBOI Taiju
金额：
$ 2.62万
依托单位：
Kyoto Sangyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

In addition to the optical study to achieve room-temperature stable color centers lasers using F_3^+, F_2, F_2^+ and F_2^- color centers in LiF crystal, the spectroscopic investigation of optical materials used for rare-earth-ion solid state lasers has been undertaken. The main results are as follows. (1) Laser oscillation experiment was done for the F_3^+, F_2, F_2^+ and F_2^- color centers in LiF crystal, which were created by irradiation with γ-rays, using two-mirror cavity. Laser oscillations by F_3^+, F_2, F_2^+ and F_2^- color centers were achieved. (2) Stable laser oscillation by F_2^+ color centers, however, was not achieved because they are decayed at room temperature immediately after creation. We achieved stable F_2^+ color center laser oscillation at room temperature using the F_2^+ color centers created by photochemical reaction from the stable F_2 color centers. (3) It was confirmed that the LiF color center lasers except the LiF: F_2^- color center laser are not stable and show weak laser output power. (4) We revealed the presence of the higher excited states for the F_2^- and F_3^- color centers, and evaluated the values of absorption and emission cross-sections, oscillator strength, emission efficiency, emission polarization, emission decay time, etc. for these color centers. (5) We observed the energy transfer among the F_3^-, F_4 and F_2^- color centers, and clarified its process. (6) We measured the absorption, emission, two-photon excited emission, and emission decay time of the rare-earth ions in ionic crystals, and we clarified the electron-lattice interaction and relaxation process of Er^<3+>, Yb^<3+>, Tm^<3+>, Ce^<3+>, Tb^<3+>, Eu^<3+>, Eu^<2+> ions and energy transfer between Er^<3+> and Yb^<3+> and between Ce^<3+> and Tb^<3+>. (7) We created the F_2^<+*> and F_2 centers in Eu^<2+>-doped CsI and Eu^<3+>- and OH^--doped LiF crystals by irradiation with γ-rays, from which we clarified the effect of rare-earth ions on the color centers.

除了利用LiF晶体中的F_3^+、F_2、F_2^+和F_2^-色心实现室温稳定色心激光器的光学研究外，用于稀土离子固态的光学材料的光谱研究(1) 对F_3^+、F_2、F_2^+、F_2^-色心进行激光振荡实验通过γ射线照射，利用F_3^+、F_2、F_2^+和F_2^-色心进行激光振荡，获得了LiF晶体。 (2)通过F_2^+实现了稳定的激光振荡。然而，色心并未实现，因为它们在创建后立即在室温下衰减。我们使用由稳定的 F_2 色心通过光化学反应产生的 F_2^+ 色心 (3) 已证实除 LiF: F_2^- 色心激光器外的 LiF 色心激光器不稳定并且表现出较弱的激光输出功率。）我们揭示了F_2^-和F_3^-色心的较高激发态的存在，并评估了吸收和发射截面的值、振荡器强度、发射效率、发射偏振、发射衰减时间， (5) 观察了F_3^-、F_4和F_2^-色心之间的能量转移，并阐明了其过程。 (6) 测量了吸收、发射、双光子激发发射、离子晶体中稀土离子的发射衰减时间和发射衰减时间，阐明了Er^<3+>、Yb^<3+>、Tm^<3+>的电子-晶格相互作用和弛豫过程， Ce^<3+>、Tb^<3+>、Eu^<3+>、Eu^<2+> 离子以及 Er^<3+> 和 Yb^<3+> 之间以及 Ce^< 之间的能量转移(7) 我们在 Eu^<2+> 掺杂的 CsI 和 Eu^<3+>- 和 OH^- 中创建了 F_2^<+*> 和 F_2 中心。 LiF晶体由γ射线照射，阐明了稀土离子对色心的影响。