Thin film light amplifier with optical feedback

Optoelectronic logical system with thin film photoconducting and electroluminescent devices

“…The instantaneous value of the current i through a PC element is given by the formula5: (1) where: u is the instantaneous value of the voltage on the 1 element; G01 is the dark conductance of the PC1 element; c:N: I the capacitance of the PC element; G is the instantaneous value of conductance of PC1 element illuminated with a light of illumination L. The illumination L is given by the expression:…”

PC‐EL Type Thin Film Optoelectronic Memory System

“…Results from previous investigations 2,7 show that the limiting value LIM depends on the frequency of voltage supplying the PC1-EL1 system (Fig. 5).…”

Bias-free time-integrating optical correlator using a photorefractive crystal

“…This can be achieved by combining the PD and LED arrays in a single compact hybrid or monolithic structure that can also be made to contain all ICs for thresholding, amplification, and driving of LEDs. Optical feedback becomes even more attractive when we consider that arrays of nonlinear optical light amplifiers with internal feedback 9 or optical bistability devices (OBDs)' 0 can be used to replace the PD/LED arrays. This can lead to simple compact CAM structures that may be interconnected to perform higherorder computations than the nearest-neighbor search performed by a single CAM.…”