Longpass Filters

Colored Glass Alternative Longpass FiltersOur colored glass alternative long-pass edge filters are a great alternative to standard colored glass filters. Using Newport's patented StabilifeĀ® coating technology, many layers of refractory metal oxide film are deposited under vacuum in a precise sequence, defining the spectral signature of the filters. Unlike Colored-Glass filters which rely upon absorption to create the filter's spectral response, CGA filters utilize optical interference phenomena to create wide bands of very-high reflectance to create the blocking region of the filters, and wide bands of very-low reflectance to create the transmission bands of the filters.

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Colored Glass Longpass FiltersOur colored glass longpass optical filters are made from high quality Schott absorptive filter glass. These long-wave pass edge filters are precision polished for demanding research or OEM applications.

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Standard Longpass FiltersThese longpass edge filters are made with hard dielectric filter coatings, producing a very steep transition between passband and stopband making them far superior to absorptive colored glass filters.

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