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Measuring the modulus of the spatial coherence function using an error tolerant phase shifting algorithm and a continuous lateral shearing interferometer

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Harder,  Irina
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Rothau,  Sergej
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Schwider,  Johannes
Optical Design and Microoptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Harder, I., Eisner, M., Voelkel, R., Rothau, S., Schwider, J., & Schwider, P. (2016). Measuring the modulus of the spatial coherence function using an error tolerant phase shifting algorithm and a continuous lateral shearing interferometer. OPTICS EXPRESS, 24(5), 5087-5101. doi:10.1364/OE.24.005087.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-62F9-9
Abstract
The modulus of the degree of coherence can be derived from interference patterns either by using fringes and next neighbour operations or by using several interferograms produced through phase shifting. Here the latter approach will be followed by using a lateral shearing interferometer exploiting a diffractive grating wedge providing a linearly progressive shear. Phase shifting methods offer pixel-oriented evaluations but suffer from instabilities and drifts which is the reason for the derivation of an error immune algorithm. This algorithm will use five pi/2-steps of the reference phase also for the calculation of the modulus of the coherence function. (C) 2016 Optical Society of America