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Phase-shifting lateral shearing interferometer with two pairs of wedge plates
Hyun-Ho Lee1, Jang-Hoon You, Seung-Han Park
1National Research Laboratory of Nonlinear Optics, College of Science, Yonsei University, Seoul 120-749, Korea.
Optics Letters
|December 3, 2003
Abstract:
We present a compact and robust phase-shifting lateral shearing interferometer that produces shearing fringes in orthogonal directions without any mechanical rotation or precise alignment. It consists of two pairs of wedge plates, a beam splitter, and a single CCD camera. Both phase-shifting and tilt for lateral shearing are achieved with two pairs of wedge plates, which can reduce systematic errors caused by external vibration and atmospheric disturbance.