Abstract
Abstract We describe a novel conoscopic method for the accurate determination of the optic axis and the thickness of birefringent samples such as liquid crystals. The method consists of synthesizing the entire effective range of the angle of incidence by rotating the sample about a narrow incident beam, thus producing a very large numerical aperture for the incident beam. Furthermore, the sample observation is made locally over a small area and unlike the conventional microscope conoscopy, the proposed scanning technique offers an additional advantage in terms of an extremely high working distance. In the case of a liquid crystal application, this helps us to add any auxiliary equipment around the sample under observation.
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