18 August 2014 Design of new window function of phase extraction algorithm in wavelength tuning Fizeau interferometer
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For the surface shape measurement of a semiconductor with a highly reflective index, it is important to effectively suppress the harmonic signals from multiple reflections. In application, the phase extraction algorithm should have a maximum value when there is no phase-shift miscalibration. In this presentation, a new 4N - 3 phase extraction algorithm, which has the ability to suppress harmonic signals and exhibits a fringe contrast maximum value when there is no phaseshift error, was derived. This new 4N - 3 algorithm consists of a new polynomial window function and a discrete Fourier transform term and has the ability to compensate for 2nd-order nonlinearity in the phase shift. The suppression ability of the new polynomial window function is compared with other conventional window functions. The sampling functions of the new 4N - 3 algorithm have much smaller amplitudes in the vicinity of the detection frequency than does synchronous detection or other phase extraction algorithms with conventional window functions.
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Yangjin Kim, Yangjin Kim, Kenichi Hibino, Kenichi Hibino, Naohiko Sugita, Naohiko Sugita, Mamoru Mitsuishi, Mamoru Mitsuishi, } "Design of new window function of phase extraction algorithm in wavelength tuning Fizeau interferometer", Proc. SPIE 9203, Interferometry XVII: Techniques and Analysis, 92030Q (18 August 2014); doi: 10.1117/12.2061476; https://doi.org/10.1117/12.2061476

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