Abstract
Fundamental properties of phase modulation ability of a nematic liquid-crystal (NLC) cell is first studied. Based on the phase modulation property of the liquid-crystal (LC) cell, a new type of speckle shearing interferometer is proposed. In the method, a LC cell is employed as a phase shifter to implement the phase shifting method for the conventional speckle shearing interferometer. Next, a phase unwrapping method that particularly has the advantage of unwrapping of phase distribution with severe noise such as those obtained in speckle interferometry is proposed. Computer simulations were carried out to examine the performance of the proposed method. Finally, experiments were made to demonstrate the usefulness of the proposed phase shifting speckle interferometer together with the improved phase unwrapping method.
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