Large second-order optical nonlinearities of fresnoite-type crystals in transparent surface-crystallized glasses
Large second-order optical nonlinearities of fresnoite-type crystals in transparent surface-crystallized glasses
复制标题
DOI：
10.1063/1.1664022
复制
发表时间：
2004-04-01
影响因子：
3.2
通讯作者：
Komatsu, T
中科院分区：
文献类型：
--
作者：
Takahashi, Y;Benino, Y;Komatsu, T
用Maker条纹技术测量了由Fresnoite型晶体组成的透明表面晶化玻璃的二阶光学非线性d（33）值，得到了Ba_2TiSi_2O_8（BTS）、Sr_2TiSi_2O_8（STS）和Ba_2TiGe_2O_8（BTG）的二阶光学非线性d（33）值。发现所有这些晶体都显示出大的d（33）值，即，BTS的d（33）=13+/-2 pm/V，STS的d（33）=7.2+/-0.4 pm/V，BTG的d（33）=22+/-3 pm/V。特别强调的是，BTG具有非常大的d（33）值，与LiNbO 3单晶相当。结果表明，随着c/a比的增大，fresnoite型晶体的d（33）值增大。有人建议，在c/a比的增加的结果在伸长的TiO 5金字塔单元沿着c轴，从而增强在fresnoite型结构的自发极化。透明的表面晶化玻璃是一种具有非线性光学特性的玻璃材料。(C)2004年，美国物理学会。
Second-order optical nonlinearities, d(33) values, of fresnoite-type crystals, Ba2TiSi2O8 (BTS), Sr2TiSi2O8 (STS), and Ba2TiGe2O8 (BTG), have been evaluated by measurements on transparent surface-crystallized glasses consisting of fresnoite-type crystals with the Maker fringe technique. It is found that all these crystals show large d(33) values, i.e., d(33)=13+/-2 pm/V for BTS, d(33)=7.2+/-0.4 pm/V for STS, and d(33)=22+/-3 pm/V for BTG. In particular, it is emphasized that BTG has an extremely large d(33) value, comparable to LiNbO3 single crystal. It is clarified that the d(33) value of fresnoite-type crystals increases with increasing c/a ratio in the lattice parameters of their structures. It is suggested that the increase in the c/a ratio results in the elongation of TiO5 pyramidal units along the c axis, consequently enhancing spontaneous polarizations in the fresnoite-type structure. Transparent surface-crystallized glasses consisting of fresnoite-type crystals are candidates for nonlinear optical materials. (C) 2004 American Institute of Physics.