Optimal holographic Fourier-transform lens

Abstract

A Fourier-transform holographic optical element is described that has low aberrations over an extended range of spatial frequencies. The design is based on a relatively simple analytic solution involving optimization by minimizing the output wave-front deviations. We recorded the holographic element with the aid of a computer-generated hologram which was placed in one of the recording beams. The optimized element demonstrated much lower aberrations, over a 6° field, than the comparable spherical holographic lens.