A new technique to measure the principal refractive indexes of a nematic liquid crystal is presented. The method is based on an indirect measurement of the refraction angle by determining the direction of a magnetic field which minimizes the light scattering. With this technique one can perform different light scattering experiments, which require a knowledge of the refractive indexes, on the same crystal slab. The accuracy is better than ±0.15%. A discussion about the systematic error due to the distortion of the director profile near the holder edges and the relative correction is given.
© 1982 Optical Society of America
Original Manuscript: May 18, 1982
Published: November 15, 1982
E. Miraldi, C. Oldano, L. Trossi, and P. Taverna Valabrega, "Direct measurement of the two principal refractive indexes of a nematic liquid crystal slab," Appl. Opt. 21, 4163-4166 (1982)