Design And Performance Of High-Speed Optically-Addressed Spatial Light Modulators

W. Li; T. Kuo; G. Moddel; K. M. Johnson

doi:10.1117/12.946919

22 August 1988 Design And Performance Of High-Speed Optically-Addressed Spatial Light Modulators

W. Li, T. Kuo, G. Moddel, K. M. Johnson

Proceedings Volume 0936, Advances in Optical Information Processing III; (1988) https://doi.org/10.1117/12.946919
Event: 1988 Technical Symposium on Optics, Electro-Optics, and Sensors, 1988, Orlando, FL, United States

Abstract

Optically-addressed spatial light modulators (OASLMs) utilizing a hydrogenated amorphous silicon photodiode as the photosensor and a ferroelectric liquid crystal as the modulator show great promise in high-speed, high-contrast spatial light modulation. We present the initial design, modelling, and performance of such devices. The devices are driven by a square-wave voltage, such that write and read operations take place under reverse bias, and an erase operation occurs under forward bias. Under continuous write-beam illumination the optical modulation is determined by the photoconductivity of the photosensor under forward bias. During chopped write-beam illumination the modulation is produced by the photocurrent produced under reverse bias. We find an increase in the contrast with reduced bias voltage, which is explained in terms of a series capacitance effect. Several polarization-based logic gates are described which utilize a single OASLM devices.

Citation Download Citation

W. Li, T. Kuo, G. Moddel, and K. M. Johnson "Design And Performance Of High-Speed Optically-Addressed Spatial Light Modulators", Proc. SPIE 0936, Advances in Optical Information Processing III, (22 August 1988); https://doi.org/10.1117/12.946919

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