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Development of Short-Wavelength Solid State Laser and Optical Amplification Wave Guide by New Transparent Crystallized Glasses

新型透明晶体玻璃开发短波长固体激光器和光放大波导

基本信息

批准号：
12555247
负责人：
KOMATSU Takayuki
金额：
$ 5.12万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
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

The purpose of this project is to develop new short-wavelength solid-state lasers and optical amplification wave-guide by applying new transparent TeO_2, Bi_2O_3 and GeO_2-based crystallized glasses. The following results were obtained.(1) Transparent crystallized glasses (30BaO. 15TiO_2. 55GeO_2) with fresnoite-type Ba_2TiGe_2O_8 (BTG) crystals were fabricated, and it was clarified that BTG crystals show excellent second-order optical nonlinearities. In the crystallization process, firstly benitoite-type BaTiGe_3O_9 crystals are precipitated in the glass, and then BTG crystals are formed.(2) The second-order optical nonlinearities, i.e., d_<33> value, of LaBGeO_5, LiBGeO_4 and BTG crystallized glasses fabricated in this project were determined using Maker fringe method. Firstly, it was demonstrated that the d_<33> values estimated using crystallized glasses are almost consistent with the values of corresponding single crystals. It was discovered that BTG crystallized glasses exhibit l … More argesecond-order optical nonlinearities of d_<33>- 22 pm/V, being comparable to the value of LiNbO_3 single crystals. The value of d_<33>-22 pm/V is the largest one in glass-related materials reported so far.(3) Other crystallized glasses with fresnoite-type Ba_2TiSi_2O_8 and Sr_2TiSi_2O_8 crystals were fabricated and the origin of large second-order optical nonlinearities in the fresnoite-type crystals was clarified. It was proposed that the spontaneous polarization of TiO_5 pyramidal units is enhanced by introducing Ba^<2+> and Ge^<4+> ions with large ionic radii.(4) It was demonstrated that transparent surface crystallized glasses with BTG crystals work as optical wave-guide. We propose that these crystallized glasses have a high potential for new short-wave length solid state lasers.(5) The writing of nonlinear optical single crystal-lines was succeeded through the irradiation of Nd:YAG laser operating at 1064 nm in TeO_2- and Bi_2O_3-based glasses. It was demonstrated that these crystals-lines works as optical wave-guides containing rare-earth ions. Less

本项目的目的是利用新型透明TeO_2、Bi_2O_3和GeO_2基微晶玻璃研制新型短波长固体激光器和光放大波导。获得了以下结果。(1)透明结晶玻璃（30 BaO. 15TiO_2。用Ba_2TiGe_2O_8（BTG）晶体与55GeO_2（55GeO_2）晶体进行了掺杂，发现BTG晶体具有良好的二阶非线性光学性能。在析晶过程中，首先在玻璃中析出钠长石型BaTiGe_3O_9晶体，然后形成BTG晶体。(2)二阶光学非线性，即，用<33>Maker条纹法测定了本项目所制备的LaBGeO_5、LiBGeO_4和BTG微晶玻璃的d_值。首先，证明了<33>用晶化玻璃估算的d_值与相应单晶的d_值基本一致。研究发现，BTG微晶玻璃具有良好的热稳定性， ...更多信息二阶非线性系数d_<33>（-22）pm/V，与LiNbO_3单晶相当。d_<33>（-22）pm/V是迄今为止报道的玻璃相关材料中最大的。(3)制备了具有Fresnoite型Ba_2TiSi_2O_8和Sr_2TiSi_2O_8晶体的其他结晶玻璃，并阐明了Fresnoite型晶体中大的二阶光学非线性的来源。研究表明，Ba^<2+>和Ge^<4+>离子的引入增强了TiO_5锥晶单元的自发极化。(4)结果表明，含有BTG晶体的透明表面晶化玻璃具有光波导的功能。我们建议，这些结晶玻璃具有很高的潜力，新的短波长固体激光器。(5)用1064 nm Nd：YAG激光在TeO_2和Bi_2O_3基玻璃中写入非线性光学单晶。结果表明，这些晶体作为光波导含有稀土离子。少