大尺寸氟化铽锂晶体生长与性能  

Growth and Properties of Large Size Lithium Terbium Fluoride Crystal

作　　者：李兴旺 杨宇 芦佳 董畅 王永国 徐学珍 LI Xingwang;YANG Yu;LU Jia;DONG Chang;WANG Yongguo;XU Xuezhen(Beijing Opto-Electronics Technology Co.,Ltd.,Beijing 100015,China;Science and Technology on Solid-State Lasers Laboratory,Beijing 100015,China)

机构地区：[1]北京雷生强式科技有限责任公司,北京100015 [2]固体激光技术重点实验室,北京100015

出　　处：《人工晶体学报》2023年第7期1352-1356,共5页Journal of Synthetic Crystals

摘　　要：氟化铽锂(LTF)晶体具有大的维尔德常数、低的吸收系数,是一种性能优良的磁光晶体材料,适合用作高功率、大能量激光系统用磁光器件的磁光材料。本文以高纯TbF_(3)和LiF为原料,采用电阻加热提拉法,在Ar气和CF 4混合气体保护下,成功生长出了直径达2英寸的大尺寸LTF晶体。该晶坯外观完整,具有良好的光学均匀性和较低的残留应力,He-Ne激光照射下无肉眼可见散射颗粒。该晶体还加工出了直径为10 mm的LTF晶体元件,测试其单程损耗系数、消光比、透过波前畸变和弱吸收系数等参数,结果表明生长的LTF晶体具有良好的光学质量,其维尔德常数约为市售商用TGG晶体的98%。Lithium terbium fluoride(LTF)crystal is a good kind of magneto-optical material with high Verdet constant and low absorption coefficient,which is suitable to be used in magnetic-optical devices for high-power and large energy laser systems.In this paper,large size and high optical quality LTF crystal with a diameter of 2 inch was prepared by resistance heating Czochralski method,under the conditions of a protective atmosphere mixed with Ar and CF 4.During this process,high-purity TbF_(3)and LiF were adopted as the raw materials.The optical properties of the LTF crystal were analyzed in detail.This crystal boule exhibits a complete appearance,good optical uniformity,and low residual stress,with no visible scattering particles under He-Ne laser irradiation.The LTF crystal elements with a diameter of 10 mm were processed from this boule.The parameters of the crystal elements such as the single-pass loss coefficient,extinction ratio,wavefront distortion,and weak absorption coefficient were tested.The results show that the grown LTF crystal have good optical quality.The magneto-optical performance of the LTF crystal was also researched,and its Verdet constant is about 98%of that of the commercial TGG crystals.

关 键 词：氟化铽锂 磁光晶体 提拉法 吸收系数 光学性能 磁光性能 大尺寸 

分 类 号：O734[理学—晶体学] O7820.2[一般工业技术—材料科学与工程] TB34