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20 November 2008Variable effective thickness of beamsplitter cube and dispersion error in white-light spectral interferometry
A white-light spectral interferometric technique employing a Michelson interferometer with same metallic mirrors
is used to measure the effective thickness of a beamsplitter cube. The thickness is measured for four different
beamsplitters being in two different orientations. Moreover, it is revealed that the phase function of a thin-film
structure measured by a similar interferometric technique depends on the path length difference adjusted in the
Michelson interferometer. This phenomenon is due to a dispersion error of a beamsplitter cube, the effective
thickness of which varies with the adjusted path length difference. A technique for eliminating the effect in
measurement of the phase function is described. First, the effective thickness of the beamsplitter cube as a
function of the path length difference is measured. Second, the phase function of the thin-film structure is
measured for the same path length differences as those adjusted in the first case. In both cases, the phase
is retrieved from the recorded spectral interferograms by using a windowed Fourier transform applied in the
wavelength domain.
P. Hlubina,J. Luňáček,D. Cyprian, andR. Chlebus
"Variable effective thickness of beamsplitter cube and dispersion error in white-light spectral interferometry", Proc. SPIE 7141, 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 71410X (20 November 2008); https://doi.org/10.1117/12.822378
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P. Hlubina, J. Luňáček, D. Cyprian, R. Chlebus, "Variable effective thickness of beamsplitter cube and dispersion error in white-light spectral interferometry," Proc. SPIE 7141, 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 71410X (20 November 2008); https://doi.org/10.1117/12.822378