The formation of macrostep during high-temperature phase of barium meta-borate （^-BaB204） single crystal growth has been investigated by both optical in-situ observation system and atomic force microscopy （AFM）. T...The formation of macrostep during high-temperature phase of barium meta-borate （^-BaB204） single crystal growth has been investigated by both optical in-situ observation system and atomic force microscopy （AFM）. The in- si$u observation results demonstrate that the critical linear size of growing facet exceeding the size that the macrostep generates is significantly anisotropic. The critical linear sizes are around 280 ~m and 620 ~m for {1010} and （T010} planes, respectively. AFM study illustrates that macrostep train with a height of 150 nm^200 nm is one typical morphological feature of the as-grown crystal surface. The riser of each macrostep consists of several straight and parallel sub-steps, indicating the occurrence of step bunching. Additionally, triangular sub-steps with heights of several nanometers on the treads of the macrosteps are found to be another typical feature of surface morphology, which implies a microscopically competitive bunching of sub-steps between various crystallographic orientations.展开更多
The low temperature phase barium metaborate β-BaB<sub>2</sub>O<sub>4</sub> （BBO） crystal is a new nonlinear optical material, which was first discovered by the Fujian Institute of Research o...The low temperature phase barium metaborate β-BaB<sub>2</sub>O<sub>4</sub> （BBO） crystal is a new nonlinear optical material, which was first discovered by the Fujian Institute of Research on the Structure of Matter, Academia Sinica. With its excellent physical and chemical properties, BBO crystal has been widely used for SHG, SFG and OPO. Investigations of the pyroelectric and other physical properties of BBO crystal have also been made.展开更多
基金supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 50802105)
文摘The formation of macrostep during high-temperature phase of barium meta-borate （^-BaB204） single crystal growth has been investigated by both optical in-situ observation system and atomic force microscopy （AFM）. The in- si$u observation results demonstrate that the critical linear size of growing facet exceeding the size that the macrostep generates is significantly anisotropic. The critical linear sizes are around 280 ~m and 620 ~m for {1010} and （T010} planes, respectively. AFM study illustrates that macrostep train with a height of 150 nm^200 nm is one typical morphological feature of the as-grown crystal surface. The riser of each macrostep consists of several straight and parallel sub-steps, indicating the occurrence of step bunching. Additionally, triangular sub-steps with heights of several nanometers on the treads of the macrosteps are found to be another typical feature of surface morphology, which implies a microscopically competitive bunching of sub-steps between various crystallographic orientations.
文摘The low temperature phase barium metaborate β-BaB<sub>2</sub>O<sub>4</sub> （BBO） crystal is a new nonlinear optical material, which was first discovered by the Fujian Institute of Research on the Structure of Matter, Academia Sinica. With its excellent physical and chemical properties, BBO crystal has been widely used for SHG, SFG and OPO. Investigations of the pyroelectric and other physical properties of BBO crystal have also been made.
