Thermal control filter

G - Physics – 02 – B

Patent

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88/121, 117/128

G02B 5/26 (2006.01) E04B 1/76 (2006.01)

Patent

CA 1055744

ABSTRACT OF THE DISCLOSURE Thermal control filter having a substrate capable of transmitting visible energy and having a surface with a coating thereon with the coating being formed of at least five layers identified as first through fifth layers count- ing from the substrate. The first layer is formed of a dielectric material. The second layer is a thin nucleation layer of a material different from the substrate, the third layer is formed of gold. The thin nucleation layer serves as a nucleating layer for the gold layer. The thin nucle- ation layer is thin enough so that it is substantially ineffective in changing the optical properties of the filter. The fourth layer is formed of yttrium oxide and the fifth layer is formed of a dielectric material.

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