Reduction of the error in measuring the wedge angle of transparent plates in holographic reverse-shearing interferometry

To reduce the error in measuring small wedge angles of transparent plates by holographic reverse-shearing interferometry, it is proposed to form a pair of interference patterns using joint plate rotation and alternate tuning to an infinitely wide band in the right and left patterns. The results of experimental approval of the method used to form interferograms of a glass plate with a small wedge angle, which indicate a higher sensitivity of this method and, as a consequence, a smaller measurement error, are presented.