A coherent optical system composed of a holographic mask and two Fourier lenses is described for performing an arbitrary linear transform. A set of equations for determining the amplitude-phase distribution of the mask is given. As a specific transform, the Walsh-Hadamard transform for orders 32 and 64 is optically made in 1-D space.
© 1988 Optical Society of America
Yan-Song Chen, Shi-Hai Zheng, Bi-Zhen Dong, De-Hua Li, and Guo-Zhen Yang, "Optical Walsh-Hadamard transform for orders 32 and 64," Appl. Opt. 27, 2608-2611 (1988)