Investigation on practical use of disordered type new laser crystals

无序型新型激光晶体实用化研究

基本信息

批准号：
05555001
负责人：
FUKUDA Tsuguo
金额：
$ 3.01万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555001/
关键词：
Laser crystal Growth of single crystal Laser diode pumped solid state laser Garnet crystal Continuous charging Czochralski method Crystal growth method for in-situ core doping Disordered type laser Control of dopants distribution laser c

项目摘要

Growth conditions of calcium niobium gallium garnet (CNGG) single crystals with large diameter and high quality, and those laser properties were investigated for the practical mass production and the creation of new opto-electronic system.The equilibrium distribution coefficients of lasing activators such as Nd^<3+>, Tm^<3+> and Er^<3+> in CNGG single crystals, were determined to control the uniformity of crystals, and were larger than those of other garnet crystals. The precise congruent melt composition of the CNGG single crystal was also determined. The possibility of high doping and the growth of high quality crystals were confirmed. Since the melting temperature of the CNGG single crystal was 1470ﾟC,Pt crucibles were found to be available for the crystal growth. Usefulness of Pt crucibles compared with Ir ones based on the high degree of varying the growth atmosphere and reducing the cost, was confirmed.Broad absorption and fluorescence spectra of doped CNGG single crystals based on the disordered type structure showed profitable properties as the new solid state laser host pumped by a laser diode (LD), especially by one dimensional LD array. The output laser power pumped by one dimensional LD array of Nd : CNGG single crystals exceeded that of Nd : YAG.Continuous charging system which enables the precise control of the grown crystal composition, and new crystal growth method which enables core doping and multi-functional structure, were also developed for the practical mass production. Complex structures of crucibles and surrounding constructions, and precise growth conditions were investigated.Mechanism and origin of twisting phenomena which appeared during the growth of large size crystals were discussed. The growth conditions and temperature fields of inside furnaces to avoid these phenomena were investigated.

研究了大直径、高质量钙铌镓石榴石（CNGG）单晶的生长条件及其激光特性，以用于实际批量生产和新型光电系统的创建。Nd等激光激活剂的平衡分配系数CNGG单晶中的^<3+>、Tm^<3+>和Er^<3+>被确定为控制晶体的均匀性，并且比其他石榴石的大由于 CNGG 单晶的熔化温度为 1470°C，因此还确定了 CNGG 单晶的精确同成分熔体成分。与 Ir 坩埚相比，基于高度变化的生长气氛和降低成本，Pt 坩埚可用于晶体生长。宽吸收和荧光光谱。基于无序型结构的掺杂 CNGG 单晶作为由激光二极管 (LD) 泵浦的新型固态激光主机，特别是由一维 LD 阵列泵浦的输出激光功率显示出有利的特性。 Nd：CNGG单晶的产量超过了Nd：YAG。还针对实际质量开发了能够精确控制生长晶体成分的连续充电系统，以及能够实现核心掺杂和多功能结构的新晶体生长方法研究了坩埚和周围结构的复杂结构以及精确的生长条件。研究了大尺寸晶体生长过程中出现的扭曲现象的机理和根源，探讨了避免这些现象的生长条件和炉内温度场。。