FIELD: design of structurally stabilized narrow-band filters, logic optical elements and picosecond keys of UV, visible and IR frequency ranges. SUBSTANCE: proposed narrow-band thin-film Fabry-Perot interferometer has substrate, two thin-film mirrors and intermediate layer placed between them. This layer is made from material which has low refractive index in which microcrystals formed from material with high refractive index and having size d found from relation 0.2a $$$ are placed, where a is Bohr radius of excision and 2 $$$ free-path length of electron of high-refractive material. EFFECT: enhanced functional reliability and efficiency. 5 cl, 5 dwg
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