A new reflected mode magneto-optic spatial light modulator (R-MOSLM) has been developed for miniature optical correlators and computers. A factor of 4 improvement in pixel switching sensitivity, compared to the conventional transmission mode magneto-optic spatial light modulator, has been achieved by the use of narrower drive lines, and burying the conductor into the film. A factor of 3 higher resolution and a factor of 2 higher optical efficiency have also been achieved by the use of smaller pixels and narrower pixel gaps. The smaller pixels and improved switching sensitivity permit an order of magnitude reduction in optical path length and increase in frame rate, respectively. The progress that has been made in the design of the R-MOSLM, issues concerning its fabrication, a comparison by finite element analysis of field modeling to experimentally determined current requirements to drive individual lines, and some optical characteristics are discussed.
The development of an optical correlator system and flight tests to be conducted from a remotely piloted vehicle (RPV) are described. The optical processor is based on laser gyroscope consiruction techniques and relies on 128x128 reflective-mode magnetooptic spatial light modulators for both the input image and spatial filter insertion. The input image is obtained from a visible camera in the nose of the RPV. The processing system will incorporate Kallman's invariant filters. The output of the correlator is through a 128x128 high speed CCD camera. The correlator system also includes image processing and all electronic drivers. The optical package occupies a volume less than 25 in3 while the whole processor package is less than 1 ft3 and weighs less than 40 lbs, and is ruggedized for temperature, shock, and vibration. The RPV, Eglin Air Force Base test range facilities, tower tests, telemetry, and training set acquisition are discussed.
This paper is a report on the design goals and measured characteristics of a new high resolution, high frame rate, reflected R-MOSLM device. This effort is aimed at the production of Miniature Ruggedized Optical Correlators (MROC) for optical pattern recognition. Pixel size is under one mil center to center, one-third the dimension of previous transmission mode devices, thereby reducing the optical path length by an order of magnitude. This development includes optimization of the optical and functional characteristics of the R-MOSLM device for Mu Spec systems.The Litton Electron Device Division has transitioned the device to a production environment as described in companion paper (2237-09). The MROC system description is described in companion paper (2237-06).
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