Request InfoIDEX Health & Science - Semrock Optical FiltersDiscriminating Raman spectroscopy edge filters for industrial, analytical and research applications are available from Semrock Inc. The company says ion-beam sputtering and proprietary manufacturing tools provide three times the Stokes-edge steepness and allow higher signal transmission than holographic notch filters. The thin-film filters' steep edges enable measurement of small Raman shifts. They feature deep blocking for maximum laser rejection and hard dielectric coatings for durability and permanent brightness. 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