Patent ID: 9581742
Date: 2017-02-28
CPC Classifications: G02B,G02F

Claim:
1. An integrated monolithic linear polarizer/attenuator element comprising a glass polarizer having polarizing particles therein, a multilayer light attenuating (LA) coating deposited on at least one surface of the glass polarizer and a multilayer anti-reflection (AR) coating deposited on top of the attenuation coating; the LA coating comprising a plurality of periods of a high refractive index material H and a low refractive index material L, L being selected from the group consisting of metal oxides and mixed-metal oxides having a non-zero absorption and an index of refraction greater than 1.7, and H being silicon; wherein the multilayer attenuation coating comprises at least one ITO layer having a thickness in the range of 250 nm to 600 nm, at least one Cr203 layer having a thickness in the range of 20 nm to 200 nm, and at least one silicon layer having a thickness in the range of 20 nm to 700 nm; and the AR coating comprising a plurality of periods H′L′, where H′ is a high refractive index material with n greater than 1.7 and L′ is a low refractive index material with n less than or equal to 1.7; the element having an attenuation in the range of greater than 0 dB to 3 db over the wavelength range of 1200-1700 nm; and the polarizing particles are selected from the group consisting of silver, copper and copper/cadmium.