Abstract
In many applications it is desirable to implement a correlation system capable of performing color pattern recognition. With mixed gas lasers such as the argon–krypton laser, it is possible to have a single source produce a collinear beam composed of red, green, and blue wavelengths. In this paper we investigate recording reflection and transmission matched spatial filters in photorefractive LiNbO3. We limit our discussion to simultaneous recording of the filter as opposed to sequential recording. We show that the reflection filter suffers from low diffraction efficiency as a result of grating competition, while the transmission filter suffers from wavelength crosstalk caused by grating beating. Finally, we demonstrate a transmission filter that uses a grating in the input plane to separate the wavelengths in the filter plane, and eliminate the color crosstalk.
© 1991 Optical Society of America
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