Open AccessParallel two-step phase-shifting point-diffraction interferometry for microscopy based on a pair of cube beamsplitters
Author(s) -
Peng Gao,
Baoli Yao,
Junwei Min,
Ren Guo,
Juanjuan Zheng,
Tong Ye,
Irina Harder,
Vanusch Nercissian,
Klaus Mantel
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.001930
Subject(s) - optics , interferometry , beam splitter , holography , wavefront , diffraction , cube (algebra) , holographic interferometry , physics , phase (matter) , polarization (electrochemistry) , laser , chemistry , mathematics , combinatorics , quantum mechanics
Parallel two-step phase-shifting point-diffraction interferometry for microscopy based on a pair of cube beamsplitters is proposed. The first 45°-tilted cube beamsplitter splits object wave into two parallel copies: one copy is filtered by a pinhole in its Fourier plane to behave as reference wave, while the other one remains unchanged as object wave. The second cube beamsplitter combines the object and reference waves, and then split them together into two beams. Along with the two beams, two parallel phase-shifting interferograms are obtained in aid of polarization elements. Based on the proposed configuration, slightly-off-axis interferometry for microscopy is performed, which suppresses dc term by subtracting the two phase-shifting holograms from each other. The setup is highly stable due to its common-path configuration, and has been demonstrated to be suitable for measuring moving objects or dynamic processes.