ENHANCED, DURABLE SILVER COATING STACKS FOR HIGHLY REFLECTIVE MIRRORS

摘要

The disclosure is directed to a highly reflective multiband mirror that is reflective in the VIS-NIR_SWIR-MWIR-LWIR bands, the mirror being a complete thin film stack that consists of a plurality of layers on a selected substrate. In order from substrate to the final layer, the mirror consists of (a) substrate, (b) barrier layer, (c) first interface layer, (d) a reflective layer, (e) a second interface layer, (f) tuning layer(s) and (g) a protective layer. In some embodiments the tuning layer and the protective are combined into a single layer using a single coating material. The multiband mirror is more durable than existing mirrors on light weight metal substrates, for example 6061-Al, designed for similar applications. In each of the five layer types methods and materials are used to process each layer so as to achieve the desired layer characteristics, which aid to enhancing the durability performance of the stack.

主权项

1. A highly reflective mirror having a for use in the wavelength range of 0.4 μm to 15 μm, the mirror comprising a substrate, a barrier layer on the substrate, a first interface layer on top of the barrier layer, a reflective layer on top of the first interface layer, a second interface layer on top of the reflective layer, at least one tuning layer on top of the second interface layer and at least one protective layer on top of the tuning layer,
said mirror have a reflectivity of at least 96% over the wavelength ranges of 0.4 μm to 1.8 μm and 3 μm to 15 μm at an AOI 45°.