Abstract
A novel method of correcting the aberrations of holographic projectors is
presented. The method employs an optimization algorithm to determine an
aberration-correcting phase mask composed of 13 Zernike Polynomials. The mask can be
used thereafter to correct every image produced by the projector. Two optimization
algorithms are demonstrated: a hybrid genetic steepest descent algorithm and a heuristic
variant of steepest descent. The primary advantage of these methods is that no
modifications of the standard holographic projector are required. Furthermore, the
methods are fully automated. They are evaluated on two projectors with different Spatial
Light Modulator flatness profiles for three wavelengths. First, the correction is
demonstrated for both projectors on a green wavelength. It is then adapted for red and
blue wavelengths by rescaling the mask and adjusting for chromatic aberration. The
hybrid genetic-steepest-descent algorithm is compared with the heuristic steepest
descent algorithm. On average, the hybrid algorithm is found to give better and more
reliable correction than the heuristic steepest descent algorithm while taking 50%
longer to terminate. The method is also compared with non-automated interferometric
flatness measurements and is found to produce improved results.
© 2015 IEEE
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