Parallel two-step phase-shifting microscopic interferometry based on a cube beamsplitter |
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Authors: | Peng Gao Baoli Yao Junwei Min Juanjuan Zheng |
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Institution: | a State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, Chinab Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract: | Parallel two-step phase-shifting interferometry for microscopy is presented, and the recording condition for generalized two-step phase-shifting interferometry is discussed. A 45° tilted cube beamsplitter enables to replicate the orthogonally linear polarized object and reference waves into two parallel beams, respectively. As a consequence, two interferograms with quadrature phase shift are obtained along the two beams, and phase reconstructed with an improved algorithm. To reconstruct the phase distribution from the two-step phase-shifting interferograms, a certain recording condition should be satisfied. However, the recording condition has not ever been discussed before. In this paper, the recording condition for the two-step phase-shifting interferometry is derived and that is: the intensity of reference wave should be no less than two times object wave intensity. |
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Keywords: | Parallel phase-shifting interferometry (PPSI) Simultaneous phase-shifting interferometry (SPSI) Digital holography microscopy (DHM) Two-step phase-shifting interferometry |
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