Abstract

Pseudorandom encoding is a statistically-based, pixel-by-pixel mapping of complex valued modulations onto modulators that do not produce all complex values.¹ The resulting far-field diffraction pattern closely approximates that from the desired, but unimplementable, complex modulation. Since the methed is point-oriented, the desired complex modulation can be synthesized and encoded without resorting to time consuming constrained global optimizations e.g. simulated annealing,² genetic,³ and Gerchberg Saxton⁴ algorithms. In addition to reducing design time, the resulting diffraction patterns can have reasonably high diffraction efficiencies and low levels of background noise.

© 1996 Optical Society of America