Removal of scattering centers in CBO crystals by the vapor transport equilibration process

详细信息	查看全文 | 推荐本文 |

• 作者：D. Rajesh ; T. Eiro ; M. Yoshimura ; Y. Mori ; R. Jayavel ; T. Sasaki
• 关键词：A1. Defects ; A1. Phase diagrams ; A2. Top-seeded solution growth ; B1. Borates ; B2. Nonlinear optic materials ; B3. Harmonic generators
• 刊名：Journal of Crystal Growth
• 出版年：2008
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：April 2008
• 卷：310
• 期：7-9
• 页码：1950-1953
• 文件大小：456 K

摘要

Large-size cesium triborate (CsB₃O₅:CBO) crystals were grown from self-flux solutions by top-seeded solution growth. The crystals have numerous scattering centers that were found to depend on the temperature from which the crystals were grown. The weight loss measurements revealed that more weight loss occurred at the growth temperature of 74 mol%B₂O₃. During the cooling process (after growth) there is a possibility of the crystal being shifted to the off-stoichiometric composition because of cesium out-diffusion. To bring the crystals to near stoichiometric solutions, the vapor transport equilibration (VTE) process (post-growth heat treatment) was carried out and the scattering centers were reduced. The cesium atmosphere used in VTE processing was very important for the diffusion of cesium into the crystal and to bring the crystals to near stoichiometric composition.