Holographic learning machine

Details Holographic learning machine Holographic learning machine

1990-09-27

1992-06-09

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 21, 359561, 364822, G02B 2746, G06G 900

Patent

active

051212285

ABSTRACT:
A holographic learning machine comprising a volume holographic recording medium, 2N photo-detectors receiving light diffracted from the medium, and N electrical circuits subtracting respective pairs of outputs of the photo-detectors, thresholding the differences and comparing them to target values. During training, a coherent image beam shines on the recording medium and corresponding target values are supplied to the circuits. Depending on whether the comparison between the thresholded difference and the target is positive or negative, a positive error or negative error amplitude modulator in a 2N array is turned on to transmit to the recording medium light coherent with the image beam. Thereby, the full bipolar perceptron algorithm is implemented. The implementation may be integrated into a rugged, integral unit.

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