We propose and demonstrate experimentally a method for utilizing a dynamic phase-encoded photorefractive memory to realize parallel optical addition, subtraction, and inversion operations of stored images. The phase-encoded holographic memory is realized in photorefractive BaTiO3, storing eight images using Walsh–Hadamard binary phase codes and an incremental recording procedure. By subsampling the set of reference beams during the recall operation, the selectivity of the phase address is decreased, allowing one to combine images in such a way that different linear combination of the images can be realized at the output of the memory.
© 1996 Optical Society of America
Original Manuscript: August 14, 1995
Published: February 15, 1996
Cornelia Denz, Thilo Dellwig, Jan Lembcke, and Theo Tschudi, "Parallel optical image addition and subtraction in a dynamic photorefractive memory by phase-code multiplexing," Opt. Lett. 21, 278-280 (1996)