Enhancement of the measurement sensitivity in small lateral shearing holographic interferometry

Abstract

To increase the measurement sensitivity in lateral shearing holographic interferometry, it is proposed to record, without the use of nonlinear effects, a pair of interference patterns tuned to closely spaced fringes and to specify small lateral shears between interfering beams having the same magnitude but opposite directions. The measurement sensitivity is enhanced at the stage of optical processing of such a pair of holographic interference patterns upon their exact coincidence or when they are located in optically conjugate planes. According to the results of experimental verification of the method, the sensitivity of the interference patterns increased twofold and fourfold.