Two-wavelength antireflection film

Details Two-wavelength antireflection film Two-wavelength antireflection film

1993-11-24

1996-07-02

Epps, Georgia Y.

Optical: systems and elements

Having significant infrared or ultraviolet property

Multilayer filter or multilayer reflector

359589, 359653, 359722, G02B 508, G02B 528, G02B 300

Patent

active

055328717

ABSTRACT:
A two-wavelength antireflection film includes a substrate and an alternate film. The alternate film consists of alternately laminated layers of a low refractive index material and an intermediate refractive index material, in order from a light entrance side to the surface of the substrate. The low refractive index material is at least a member selected from the group consisting of MgF.sub.2, SiO.sub.2, BaF.sub.2, LiF, SrF.sub.2, AlF.sub.3, NaF, a mixture thereof and a compound thereof. The intermediate refractive index material is at least a member selected from the group consisting of Al.sub.2 O.sub.3, LaF.sub.3, NdF.sub.3, YF.sub.3, a mixture thereof and a compound thereof.

REFERENCES:
patent: 4997241 (1991-03-01), Muratomi

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