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Bandpass Interference Filters are used extensively in a variety of biotech, biomedical, and quantitative chemical applications to selectively transmit a narrow range of wavelengths while blocking all others. Interference filters are widely used in instrumentation for clinical chemistry, environmental testing, colorimetry, elemental and laser line separation, flame photometry, fluorescence, immunoassays, etc. In addition, interference filters are used to select discrete spectral lines from arc or gas discharge lamps (Hg, Xe, Cd, etc.) and to isolate a particular line from Ar, Kr, Nd:YAG, and other lasers. They are often used in conjunction with laser diodes and LEDs. Our filters are available in two types – low-cost "Traditional” Coated Filters, and high-performance “Hard” Coated Filters.
Hard Coated filters are fabricated utilizing our state-of-the-art Advanced Plasma Reactive Sputtering coating platform. This technology allows us to produce single-substrate filters with deeper blocking, higher transmission, and steeper slopes than what are available from our soft coated filters. While the filters are somewhat more expensive, the dense coating design prevents filter degradation. Thus, the long-term cost of ownership of our hard-coated filters is significantly reduced. Custom hard coated filters, with optical densities >6.0, transmission >90%, and edge-steepness of <0.5%, can be rapidly developed for OEM instrumentation.