High performance widely tunable chromachip lasers

高性能广泛可调谐 Chromachip 激光器

• 批准号: 12792003
• 负责人: TAIRA Takunori
• 金额: $ 13.89万
• 依托单位: Okazaki National Research Institutes
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for University and Society Collaboration
• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12792003/
• 关键词: Diode pumped solid-state lasers; Ceramic lasers; Chromachip lasers; Boundary controlling; Nd : YAG; Thermal birefringence; Quasi phase matching; MgO : LiNbO_3; 疑似位相整合; MgO : LiNbO3; Nd:YAG; MgO:LiNO_3

As part of the "High performance widely tunable chromachip lasers" research project we have investigated new types of solid-state microchip lasers and nonlinear wavelength conversion by the Quasi-Phase-Matching process as follows :(1) We have demonstrated highly efficient laser oscillation using highly concentrated Nd-doped YAG ceramics by grain boundary controlling. The spectrum bandwidth was controlled by changing the composition structure : Nd : YSAG ceramics that have Al sights partially replaced by Sc has 5 times wider the gain band width compared with Nd : YAG.(2) A new model that describes theoretically the thermal birefringence in high power state lasers by changing the orientation of crystal axis from <111> to <110> or <100>-axis cut without any other internal optics into the optical resonator was developed. Moreover, a new pumping method that reduces the heat generation was proposed and experimentally proved.Directly pumping into the emitting level of Nd : YAG lasers improves … More the quantum defect but the absorption efficiency is poor for low concentrated Nd : YAG (1.0-at.% Nd, usually used in construction of lasers). We demonstrated that highly Nd-doped YAG ceramics has the potential to overcome this disadvantage, assuring high absorption efficiency for this new pumping scheme. Finally, simulation source code by FEM that estimate the heat generation and its thermal problem was developed.(3) We have developed an 'in-situ' poling system that optimizes the QPM fabrication process of MgO : LiNbO_3 that is characterized by a high damage threshold. Then we have realized a periodically poled 3-mm thick MgO : LiNbO_3. Moreover, we found the way for broadening the acceptance bandwidth by using d_31 (= d_32) instead of the normal d_33 coefficient.(4) During this research project were published 25 scientific papers and 6 review papers, 33 presentations were given at international meetings and 24 at domestic meetings, as well as 12 invited talks. Finally, we have received 4 awards. Less

作为“高性能广泛可调谐色片激光器”研究项目的一部分，我们通过准相位匹配过程研究了新型固态微片激光器和非线性波长转换，如下：（1）我们通过晶界控制证明了使用高浓度 Nd 掺杂 YAG 陶瓷的高效激光振荡。通过改变成分结构来控制光谱带宽：Al瞄准部分被Sc取代的Nd:YSAG陶瓷的增益带宽是Nd:YAG的5倍。(2)一种新模型，通过将晶轴方向从<111>改变为<110>或<100>轴切割，理论上描述高功率态激光器中的热双折射，而无需任何其他内部切割 开发了光学谐振腔。此外，还提出了一种减少热量产生的新泵浦方法并进行了实验证明。直接泵浦到Nd：YAG激光器的发射能级改善了量子缺陷，但对于低浓度Nd：YAG（1.0-at.%Nd，通常用于激光器的构造），吸收效率较差。我们证明，高 Nd 掺杂 YAG 陶瓷有可能克服这一缺点，确保这种新泵浦方案的高吸收效率。最后，开发了FEM仿真源代码，用于估计热量产生及其热问题。(3)我们开发了一种“原位”极化系统，优化了具有高损伤阈值的MgO：LiNbO_3的QPM制造工艺。然后我们实现了周期性极化的3毫米厚的MgO：LiNbO_3。此外，我们找到了用d_31（=d_32）代替普通d_33系数来拓宽接受带宽的方法。（4）本研究项目期间发表了25篇科学论文和6篇综述论文，在国际会议上作了33次报告，在国内会议上作了24次报告，并邀请了12次特邀报告。最终，我们获得了4个奖项。较少的

项目成果

V. Lupei, T. Taira et al.: "Laser emission under resonant pump in the emitting level of concentrated Nd : YAG ceramics"Appl. Phys. Lett.. 79. 590-592 (2001)

V. Lupei、T. Taira 等人：“在浓缩 Nd : YAG 陶瓷的发射水平中谐振泵下的激光发射”Appl。

Y.Sato, T.Taira et al.: "Spectroscopic properties of Neodymium-doped Y_2O_3 ceramics"OSA Trends in Optics and Photonics. 50. 417-421 (2001)

Y.Sato、T.Taira 等人：“掺钕 Y_2O_3 陶瓷的光谱特性”OSA 光学和光子学趋势。

V. Lupei, T. Taira et al.: "Laser emission in highly-doped Nd : YAG crystals under ^4F_<5/2> and ^4F_<3/2> pumping"Opt. Lett.. 26(21). 1678-1680 (2001)

V. Lupei、T. Taira 等人：“^4F_<5/2> 和 ^4F_<3/2> 泵浦下高掺杂 Nd : YAG 晶体中的激光发射”Opt.

V.Lupei, T.Taira et al.: "Laser emission under resonant pump in the emitting level of concentrated Nd : YAG ceramics"Appl. Phys. Lett.. 79. 590-592 (2001)

V.Lupei、T.Taira 等人：“在浓缩 Nd : YAG 陶瓷的发射水平中谐振泵下的激光发射”Appl。

I.Shoji, T.Taira et al.: "Thermal birefringence in Nd : YAG ceramics"OSA Trends in Optics and Photonics. 50. 273-278 (2001)

I.Shoji、T.Taira 等人：“Nd : YAG 陶瓷中的热双折射”OSA 光学和光子学趋势。