利用数字全息干涉术观察RuO2：LiNbO3晶体中畴反转的区域特性

利用马赫-曾德尔干涉光路和V光学透镜系统，以部分畴反转的掺钌铌酸锂晶体（RuO2：LiNbO3）的透射光作为物光来记录全息图，并在数值再现过程对其进行频域滤波以实现物场波前信息的数值重建，检测出在一定电压作用下晶体内部折射率变化的二维分布．检测结果证实;晶体中发生畴反转的区域与发生电色效应的区域严格相符．数字全息干涉术非接触、无干扰、无破坏的优势在准实时监控、检测和分析铌酸锂晶体畴反转方面有很好的应用前景．

In order to obtain the two dimensional distribution of the refractive index changes due to the domain inversion in the RuO2 : LiNbO3 crystal, we make use of the Mach-Zehnder interferometer and 4f optical lens system to record holograms, with the object light transmitting through-the poled RuO2 : UNbO3 crystal, and then filter the spectrum in the frequency domain to get the object light spectrum for numerically reconstructing the object wavefront. The results confirm that the electro-chromic effect region well coincides with the domain inversion region in RuO2 : LiNbO3 crystal. Digital holographic interferometry has the merits of being nondestructive and it provides a prospective way to in-situ visualization, monitoring and analysis of the domain inversion in LiNbO3 crystal.