25 November 1992 Optical filter for focal-plane applications
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An IR-spatial filter is proposed for usage in a focal plane. This filter screens the IR-array locally, where the IR signal is followed by a signal in the visible region (only noisy signals or jamming interferences are assumed to be followed by visible light). The filter discussed here is based on a photosensitive spatial light (IR) modulator, abruptly diminishing its transmittance in IR, when (and where) visible light intensity is over the settled threshold. The experiments were performed when the attenuation of interference was about one order.
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Alexander V. Parfenov, Alexander V. Parfenov, Igor N. Kompanets, Igor N. Kompanets, "Optical filter for focal-plane applications", Proc. SPIE 1697, Acquisition, Tracking, and Pointing VI, (25 November 1992); doi: 10.1117/12.138170; https://doi.org/10.1117/12.138170

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