The design of a simple two lens system for optical diffraction operating within a fixed bench distance is analyzed. Geometrical conditions for large size Fourier transforms, as needed when using light modulators, are deduced within paraxial theory. Different configurations using different lenses but giving the same input output magnification are studied in order to specify its practical usefulness. A ray tracing based numerical criterion for assessing the quality of the diffractive system is used. Preliminary experimental results are presented.
"Scale-tunable diffractometer for spatial light modulators: a design procedure", Proc. SPIE 1780, Lens and Optical Systems Design, 17801A (15 April 1993); doi: 10.1117/12.142841; https://doi.org/10.1117/12.142841