RbBe_2BO_3F_2晶体的水热法生长与非线性光学性能  

Hydrothermal Growth and Nonlinear Optical Properties of RbBe_2BO_3F_2 Crystal

作　　者：周海涛[1] 何小玲[1] 卢福华[1] 刘丽娟[2] 徐滔[2] 张昌龙[1] 

机构地区：[1]中国有色桂林矿产地质研究院有限公司广西超硬材料重点实验室,国家特种矿物材料工程技术研究中心,广西桂林541004 [2]中国科学院理化技术研究所,北京100190

出　　处：《稀有金属》2015年第6期516-521,共6页Chinese Journal of Rare Metals

基　　金：广西自然科学基金项目(2011GXNSFB018014;0832020)资助

摘　　要：采用水热法生长出了深紫外非线性光学晶体Rb Be2BO3F2。通过优化晶体生长温度、矿化剂等条件生长出了尺寸为27.0 mm×14.0 mm×5.7 mm的大尺寸晶体。通过粉末X射线衍射仪（XRD）确认了晶体物相未因水热晶体生长而发生改变。比较研究了熔盐法RBBF（F-RBBF）,KBBF（L-KBBF）和水热法RBBF（H-RBBF）倍频产生400 nm激光的性能：表征了生长晶体的紫外可见透过光谱、粉末倍频能力和晶体800 nm倍频产生400 nm激光的性能。透过光谱显示在190-800 nm无明显吸收峰,透过率接近85%,与熔盐法晶体相当。粉末的倍频（SHG）强度与同条件下熔盐法晶体粉末相当。Rb2CO3矿化剂体系生长的RBBF晶体的800-400 nm倍频输出功率相比熔盐法KBBF要低,且没有随着厚度增加而增大。Rb F矿化剂体系生长的晶体800-400 nm倍频输出功率与熔盐法KBBF和RBBF相当。然而与熔盐法KBBF相比,水热法KBBF输出功率却非常低。综上,水热RBBF的800 nm基频光倍频产生400 nm光的能量与熔盐法KBBF和RBBF在相当的水平,远高于大多数水热法KBBF晶体。结果表明水热生长的Rb Be2BO3F2晶体具有与熔盐法晶体相当的非线性光学性能,在深紫外非线性光学领域有较好的应用前景。Deep ultraviolet （UV） nonlinear optical crystals of RbBe2BO3F2 were grown by hydrothermal method. The growth condi- tions were optimized mainly by adjusting the growth temperature and mineralizers, and a bulk RbBe2 BO3F2 crystal with a size up to 27.0 mm×14.0 mm×5.7 mm was obtained. The phases of the resulting crystal were confirmed by powder X-ray diffraction （XRD）. Performances of H-RBBF （ hydrothermal-grown RBBF）, F-RBBF （ flux-grown RBBF） and F-KBBF （ flux-grown KBBF） used as dou- bling crystals for the generation of 400 nm wavelengths were compared. Its linear and nonlinear optical properties including transmit- tance spectra, powder frequency-doubling effects and second harmonic generation from 800 to 400 nm were measured and compared with flux grown ones. The RBBF sample had none absorption peak and was close to 85% high transmittance at wavelengths between 190 to 800 nm. The powder second harmonic generation（SHG） intensity of H-RBBF achieved a considerable strength compared with that grown by flux method under the same condition and the same testing condition. The maximum SHG output pulse energy from 800 to 400 nm of the H-RBBF from Rb2CO3 mineralizer solution was lower than that of F-KBBF, and no increase occulted with the thickness in- creasing. Compared with F-KBBF and F-RBBF, the maximum SHG output pulse energy of the H-RBBF from RbF mineralizer solution was in a similar level from 800 to 400 nm under the same laser system. However, the hydrothermally grown KBBF sample had much lower output pulse energy than that of F-KBBF. From the SHG characterization, it was evident that the output pulse energy of H-RBBF crystals was as high as that of F-RBBF and F-KBBF （flux-grown KBBF）, but was much higher than that of most of the hydrothermal method KBBF crystals under the same laser system. The results indicated that the hydrothermally grown RbBe2 BO3 F2 crystals showed similar capability of frequency conversion with that of flux grown ones and were promising for future deep-UV har

关 键 词：RbBe2BO3F2晶体 水热法 倍频效应 

分 类 号：O07[理学]