摘要
分析表明，当光在双轴晶体中波矢沿着某些特定方向传播时，不会表现出一阶热致静态位相延迟，这个方向暂时被称为晶体的无热致静态位相延迟光传播方向（ＮＴＳＰＲ方向）。根据前人发表的相关数据，采用适当近似，求得ＫＮｂＯ３的ＮＴＳＰＲ方向是（９０°，９０°±５０．１９°，５０．１９°），ＫＴＰ的ＮＴＳＰＲ方向是（９０°±３０．７８°，９０°，３０．７８°），并分别讨论了这两种晶体在这些方向的电光品质因数ηｅ，结果表明，利用某些双轴晶体ＮＴＳＰＲ方向大的电光品质因数制成的新型、单块晶体结构电光开关，不需要温控，而且，器件本身的通光长度可以做得更短。
A careful analysis demonstrated that when optical beams propagated with the wave vector parallel to the some orientations in biaxial crystals, they would not exhibit the first order thermal induced static phase retardation. These orientations were now called NTSPR directions of the crystals. In this paper, taking some approximations, we theoretically founded the NTSPR directions in KNbO 3 and KTP crystals, with the help of the relative data from the literature. Also, the EO figure of merits at these NTSPR directions in KNbO 3, KTP crystals is discussed. The calculations implied that with the large EO figure of merits at these NTSPR directions in some biaxial crystals, the novel single crystal EO switches would have short propagation length and need not to be temperature controlled compared to EO switches of traditional structure.
出处
《中国激光》
EI
CAS
CSCD
北大核心
1999年第6期502-506,共5页
Chinese Journal of Lasers
关键词
电光开关
双轴铁电晶体
晶体
NTSPR
KTP
KNbO 3, KTP electro optic switch, thermal induced static phase retardation, electro optic figure of merits
