提出了利用光折变的各向异性衍射特性在单块LiNbO3晶体中建立光折变2×2开关组件的方案.为减少记录的各光折变全息组件之间的串扰,采用局域热固定.基于衍射效率公式,分析最佳衍射效率时入射光强比和写入角之间的关系.所建立的光开关具有小型化和垂直的输入/输出的特点.

A scheme using anisotropic diffraction to implement the 2×2 switching element in a one block Fe∶LiNbO 3 photorefractive crystal is suggested. To decrease the crosstalk among the four individual photorefractive holograms, a thermal fixing scheme by a CO 2 laser is quoted. Based on Kogelnik diffraction efficiency equation, the relation between the optimal incident intensity ratio and the writing angles is analyzed. It is shown that the switch proposed has the properties of normal input, output and miniaturization.