Extended area diffractive subtractive color filters

Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Physical developing

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350311, 350320, 430 1, 430321, G02B 518

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active

043726496

ABSTRACT:
Large area, diffractive subtractive color filters are provided from a density image of a standing wave interference fringe field pattern in a high speed, high resolution silver halide photographic plate. The high speed enables conventional coherent sources to be spread out to provide a low but constant intensity over extended areas, while still enabling the production of the density image at exposure times sufficiently short to preclude vibrational degradation in resolution. The plates are then developed, overcoated with a photoresist and back-exposed, after which the photoresist is developed to provide a subtractive filter having an extended area surface relief pattern which includes a width controlled periodic diffraction grating.

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Burch et al., "Interferometric Methods for . . . Large Gratings", Optical Acta, vol. 1, No. 1, Jan. 1961, pp. 73-80.
"Microfiche in Color Made by Diffraction", Electronics, vol. 49, No. 15, Jul. 1976, pp. 4E, 6E.

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