Patent ID: 9194987
Filing Date: 2015-11-24
Classification: G02B

Abstract:
1. An optical element, comprising: a substrate made of sapphire; and a film covered on the substrate and configured for increasing reflectivity of ultraviolet lights and filtering the ultraviolet lights; the film comprising a plurality of high refractive index layers and a plurality of low refractive index layers alternately stacked on the substrate, wherein the film is stacked by a first layer to a forty fourth layer in an order facing away from the substrate, the high refractive index layers are the odd number layers, the low refractive index layers are the even number layers, thicknesses of the first through forty fourth layers are about 14 nm, 38 nm, 17 nm, 16 nm, 20 nm, 41 nm, 21 nm, 37 nm, 17 nm, 39 nm, 25 nm, 45 nm, 19 nm, 35 nm, 19 nm, 34 nm, 10 nm, 20 nm, 19 nm, 31 nm, 15 nm, 32 nm, 35 nm, 42 nm, 28 nm, 43 nm, 15 nm, 28 nm, 35 nm, 44 nm, 27 nm, 74 nm, 29 nm, 57 nm, 26 nm, 69 nm, 36 nm, 35 nm, 43 nm, 39 nm, 39 nm, 30 nm, 22 nm, 84 nm, respectively, and the error of the thickness of each layer is ±3 nm.