Abstract

A scheme is presented that uses cascaded two-beam coupling interactions to optically generate a log transform. By optimizing the two free parameters of gain coefficient and beam intensity ratio for each interaction region, we have generated a computed output intensity that is the natural log of the input intensity, with an accuracy of better than 1% over a four decade dynamic range.

© 1990 Optical Society of America

Image amplification by two-wave mixing in photorefractive crystals

John H. Hong, Arthur E. Chiou, and Pochi Yeh
Appl. Opt. 29(20) 3026-3029 (1990)

Orientational dependence of photorefractive two-beam coupling in InP:Fe

J. Strait, J. D. Reed, and N. V. Kukhtarev
Opt. Lett. 15(4) 209-211 (1990)

Theory of beam coupling and pulse shaping of mode-locked laser pulses in a photorefractive crystal

X. Steve Yao, Vince Dominic, and Jack Feinberg
J. Opt. Soc. Am. B 7(12) 2347-2355 (1990)

Image deconvolution by a logarithmic/exponential nonlinear joint transform process

Bahram Javidi, Carol Ruiz, and Jack Ruiz
Appl. Opt. 29(5) 685-690 (1990)

Photorefractive two-beam coupling joint transform correlator: modeling and performance evaluation

G. Nehmetallah, J. Khoury, Mohammad Alam, and P. P. Banerjee
Appl. Opt. 55(15) 4011-4023 (2016)