A two-dimensional measurement method for a birefringence vector distribution differs from a point-measurement method not only in the two-dimensional system nonuniformity but also in the system reliability. The previously proposed intrinsic vector allowed for the elimination of the influence of the system nonuniformity, whereas the two-dimensional system reliability is ensured by both an online diagnosis technique and an image lock-in processing. It is revealed that the measured intrinsic vector is relevant not only with the birefringence vector distribution in a sample but also with the natural birefringence vector distributions that exist in the optic components. The complete solution from the measured intrinsic vector results in a bidirectional vector for the desired birefringence vector distribution. The correctness of the two-dimensional measurement principle is examined by means of a comparison of the measured data with that calculated from a finite-element analysis based on the photoelastic effect.
© 1999 Optical Society of America
Yongchang Zhu, Takehiro Koyama, Tatsuo Takada, Yoshihiro Murooka, and Toshihisa Otsuka, "Two-Dimensional Measurement Technique for Birefringence Vector Distributions: Data Processing and Experimental Verification," Appl. Opt. 38, 2216-2224 (1999)