Optical filter screening out infrared and ultraviolet light

Details Optical filter screening out infrared and ultraviolet light Optical filter screening out infrared and ultraviolet light

2007-05-01

2007-05-01

Nguyen, Thong Q. (Department: 2872)

Optical: systems and elements

Having significant infrared or ultraviolet property

Multilayer filter or multilayer reflector

C359S361000, C359S584000, C359S588000, C359S589000

Reexamination Certificate

active

11416725

ABSTRACT:
An optical filter includes a transparent substrate, a first film stack and a second film stack. The first and second film stacks each includes a number of high refractive index layers and a number of low refractive index layers alternately stacked one on another. The first film stack is defined as (HL)7(0.76H0.76L)6, and the second film stack is defined as 0.5(HL)(1.3H1.3L)9(HL)8, wherein, H represents a high refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, L represents a low refractive index layer having a base optical thickness equal to one fourth of a first reference wavelength associated with the optical filter, the expression enclosed in each parenthesis represents a filter cavity, and the superscript represents the number of repetition of the expression enclosed in that parenthesis.

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