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借助于顶端籽晶溶液法,采用[110]和[111]方向籽晶生长了大尺寸高质量三硼酸铋(BiB_3O_6,BIBO)单晶,尺寸为30mm×30mm×40mm,最大晶体质量接近100g。用X射线衍射和偏光显微镜确定折射率主轴方向与结晶轴方向x//b,(y,c)=47.2°,(z,a)=31.6°。根据折射率色散方程计算了位相匹配方向,实验确定1064 nm激光倍频方向(168.9,°90°),三倍频方向(146.4°,90。),946 nm激光的倍频方向(161.9°,90°)。以2.4 mm和6 mm长BIBO晶体实现了1064 nm激光的倍频和三倍频,效率分别为67.7％和39.5％(10 Hz,35 ps);以5 mm长的BIBO晶体分别在钛宝石激光器和LD泵浦Nd:YAG准连续激光器实现了946 nm到473 nm的激光输出,总效率分别为5.2％和4.8％,后者采用10 mm的LBO晶体作对比,其总效率为2.7％。讨论了晶体生长中遇到的主要问题及其解决办法,并指出BIBO的抗光损伤阈值是值得重视的问题。
Large size high quality bismuth triborate (BiB_3O_6, BIBO) single crystals were grown by [110] and [111] seed with the size of 30mm × 30mm × 40mm and the maximum crystal mass close to 100g by means of the top seed solution method. The refractive index main axis direction and the crystallographic axis direction x // b were determined by X-ray diffraction and a polarizing microscope. (Y, c) = 47.2 °, (z, a) = 31.6 °. The direction of phase matching was calculated according to the dispersion equation of refractive index. The frequency doubled direction of laser at 1064 nm (168.9 °, 90 °), the triplet frequency (146.4 °, 90 °) and the frequency of 946 nm (161.9 °, 90 °). The doubling and triplet frequencies of 1064 nm laser were achieved with 2.4 mm and 6 mm long BIBO crystals with efficiencies of 67.7% and 39.5%, respectively (10 Hz and 35 ps). A 5 mm long BIBO crystal was grown on a Ti: sapphire laser And LD-pumped Nd: YAG quasi-continuous lasers achieved a laser output of 946 nm to 473 nm with total efficiencies of 5.2% and 4.8%, respectively. The latter was compared with a 10 mm LBO crystal for a total efficiency of 2.7%. The main problems encountered in crystal growth and their solutions are discussed. It is pointed out that the threshold of light damage resistance of BIBO is worthy of attention.