Recursive wavefront aberration correction method for LCoS spatial light modulators

Discontinued Devices LC-R 2500 Spatial Light Modulators
Digital-/ Computer Holography/ CGH
Published on:
Authors: J. García-Márquez, J.E.A. Landgrave, N. Alcalá-Ochoa, C. Pérez-Santos
Abstract:
“We present two accurate and relatively simple interferometric methods for the correction of wavefront aberrations of about 3 wavelengths (3λ) in spatial light modulators (SLMs) of the liquid crystal on silicon (LCoS) type. The first is based on a recursive use of a wavefront fitting algorithm in a Wyko™ interferometer, in which Zernike polynomials are employed as the basis functions. We show here that the successive use of only three measurements is required to obtain a peak-to-valley (PV) error as low as λ/10, with an uncertainty of λ/30, in the compensated wavefront. The second method makes use of the actual optical path difference (OPD) computed by the interferometer at each pixel of the image of the interferogram of the LCoS modulator (LCoS-M). From numerical interpolation of these OPD values we were able to assign the required OPD compensation at each pixel of the LCoS-M. With this method, PV errors of the compensated wavefront as low as λ/16, with an uncertainty of λ/30, were obtained for the entire LCoS-M, or of λ/33 for the disk that we used as the domain of the Zernike polynomials in the first method.”

Restricted Access

Publication: Optics and Lasers in Engineering
Issue/Year: Optics and Lasers in Engineering, Volume 49, Issue 6, Pages 743-748, (2011)
DOI: 10.1016/j.optlaseng.2011.01.024
Link: https://doi.org/10.1016/j.optlaseng.2011.01.024

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