The wavefront retrieval method using a programmable optical signal processor with a spatial light modulator , lens and point- photodetector , which
is performing the general Fourier series expansion is described.
Nickolay I. Dmitriyev,
"Wavefront measurement method using optoelectronic Fourier processor", Proc. SPIE 1271, Adaptive Optics and Optical Structures, (1 August 1990); doi: 10.1117/12.20397; https://doi.org/10.1117/12.20397