Spatial light modulation device capable of arbitrarily selecting

Details Spatial light modulation device capable of arbitrarily selecting Spatial light modulation device capable of arbitrarily selecting

1991-04-08

1992-12-08

LaRoche, Eugene R.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359255, 359262, 359263, 359277, G02F 103, G02F 101

Patent

active

051702819

ABSTRACT:
A spatial light modulator includes an electro-optic crystal plate and a mesh electrode for capturing secondary electrons emitted from the crystal plate. Primary electrons carrying an image corresponding to an input optical image are incident on the front surface of the crystal plate to write a charge pattern thereon. In a writing operation, a dc voltage and a ramp voltage is applied to the mesh electrode and the back surface of the crystal plate, respectively. The dc voltage and a variation range of the ramp voltage are shifted to obtain a desired input/output characteristic of the device. Alternatively, a decreasing rate of the ramp voltage is changed to obtain a desired characteristic.

REFERENCES:
patent: 4481531 (1984-11-01), Warde et al.
patent: 4741602 (1988-05-01), Hara et al.
patent: 4763996 (1988-08-01), Hara et al.
patent: 4830472 (1989-05-01), Mukouzaka
patent: 4923287 (1990-05-01), Ooi et al.
J. A. McEwan, et al. "Four Special Functions of a Microchannel Spatial Light Modulator" Postdeadline Papers, Conference on Laser and Electro-Optics, Paper 1 ('85).
"Variable Nonlinear Transfer Characteristics of MSLM", Japanese Journal of Applied Physics, vol. 29, No. 8, Aug., 1990, pp. 1529-1532.
T. Hara et al., "A Spatial Light Modulator" Advances in Electronics and Electron Physics, vol. 64B, pp. 637-647. Copyright 1985.

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