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1 May 2008 Phase retrieval from the spectral interferograms by windowed Fourier transform
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Abstract
We present a new method of phase retrieval from the spectral interferograms, which is based on the use of a windowed Fourier transform applied in the wavelength domain. First, the numerical simulations are performed to demonstrate high precision of the phase retrieval from the spectral data related to a slightly dispersive Michelson interferometer comprising a thin-film structure. Second, the feasibility of the method is confirmed in processing experimental data from the Michelson interferometer with SiO2 thin film on a silicon wafer to determine precisely the thin-film thickness. We confirm very good agreement with the previous results obtained by the fitting of the recorded spectral interferograms to the theoretical ones. Finally, the method is used in processing experimental data from the Michelson interferometer with two metallic mirrors. From the retrieved phase function, the effective thickness of the beamsplitter made of BK7 glass is determined precisely.
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P. Hlubina, J. Luňáček, D. Ciprian, R. Chlebus, and M. Luňáčková "Phase retrieval from the spectral interferograms by windowed Fourier transform", Proc. SPIE 6995, Optical Micro- and Nanometrology in Microsystems Technology II, 69950Z (1 May 2008); https://doi.org/10.1117/12.778303
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