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Ultra-narrowband optical interference filter with a 855.125 nm center wavelength (CWL), a 0.75 nm full-width at half-maximum (FWHM), and wide-range OD6 out-of-band blocking from 200 nm to 1200 nm. This is a multi-cavity filter with exceptionally steep edges, a flat top, and transmission that is greater than 85% at 855.125 nm. This unmounted ultra-narrowband filter is coated on a 0.7 mm thick Borofloat® substrate and is 12.6 mm (± 0.1 mm) in diameter. Alluxa ultra-narrow bandpass filters have the highest transmission and narrowest bandwidths currently available. And because they are hard-coated using our innovative SIRRUS? plasma deposition process, all Alluxa optical filters are highly durable and resistant to laser damage. Contact us for custom sizing options.