A novel quantitative method, based on the moiré effect, for mapping ray deflections of a collimated light beam is described and. demonstrated. This method, which does not require coherent light, can replace interferometric techniques in many cases. The proposed setup is simple, and the interpretation is straightforward. We demonstrate deflection mapping of a candle’s flame with a resolution of 5 × 10−5 rad and lens mapping with a resolution of 10−2 rad. An analysis of the ray deflection for index-of-refraction mapping is provided.
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