OPTICAL FILTER AND STERILIZATION DEVICE
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United States of America
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Nov 7, 2024
app pub date -
Sep 2, 2022
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Sep 2, 2022
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Provided is an optical filter in which a dielectric multi-layer film is less likely to separate from a transparent substrate. An optical filter 1 includes: a transparent substrate 2 made of glass; and a dielectric multi-layer film 3 provided on the transparent substrate 2 and containing hafnium oxide, wherein a surface of the transparent substrate 2 on the dielectric multi-layer film 3 side has an arithmetic mean height Sa of 0.22 nm or less.
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