25 Oct 2010 With two well equipped holographic laboratories supporting Wire Grid Polariser production at Optometrics USA, the fabrication process incorporates multiple infrared materials. Distributed by LASER COMPONENTS UK, the performance of these polarisers is optimised by a careful choice of the overcoatings where appropriate.
Calcium Fluoride (CaF2) and Barium Fluoride (BaF2) have low refractive index (high Tx) values and do not require anti-reflective (AR) coatings. Zinc Selenide (ZnSe) has a high refractive index and transmission at specific wavelength regions that which can be enhanced by an AR coating on the rear surface only. ZnSe is usually optimized for transmission at specific laser lines, typically from 9 to 11µm. KRS-5 is not normally AR coated as otherwise its broad transmission range, which is its primary advantage, would be restricted. Germanium (Ge) is AR/AR coated to maximize transmission at 10.6 microns.
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Wire Grid Polarisers
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