Ligh Resolution Infrared Laser Projector For Use With Infrared Spatial Modulators

B. M . Wallace; S. Sullivan

doi:10.1117/12.944539

27 November 1984 Ligh Resolution Infrared Laser Projector For Use With Infrared Spatial Modulators

B. M . Wallace, S. Sullivan

Proceedings Volume 0498, Laser Scanning and Recording; (1984) https://doi.org/10.1117/12.944539
Event: 28th Annual Technical Symposium, 1984, San Diego, United States

Abstract

The LTV Aerospace and Defense Company is currently developing a two dimensional infrared spatial modulator system. A laser projector using an 18 watt ND:YAG laser writes a raster on the modulator which is back illuminated by a blackbody source. Subsequently, the two dimensional infrared pattern is projected onto an IR sensor for viewing. The paper describes the optical and system design criteria of the laser projector which is used to write onto the spatial modulator. The laser projector employs a number of novel techniques to meet the performance specification of the system. In this application an acousto-optic modulation technique known as Scophony modulation is used. Scophony modulation was originally proposed at the beginning of this century for conventional television projection. For current laser projectors it has a number of inherent advantages which range from the ability to modulate high powered lasers with high temporal bandwidths, to improved spatial resolution which results from the coherent imaging process. The expected horizontal resolution is equivalent to 1325 line resolution in the visible region of the spectrum.

Citation Download Citation

B. M . Wallace and S. Sullivan "Ligh Resolution Infrared Laser Projector For Use With Infrared Spatial Modulators", Proc. SPIE 0498, Laser Scanning and Recording, (27 November 1984); https://doi.org/10.1117/12.944539

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KEYWORDS

Modulators

Modulation

Acoustics

Diffraction

Projection systems

Coherence imaging

Imaging systems

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