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Optical filter / infrared-reject - 1 - 100 µm
A wide range of custom infrared filters by Knight Optical are supplied for use in the IR wavebands. These are available as per specifications of the customers, and are custom-made. Some of them are Custom Infrared Interference bandpass filters, comprise, narrow pass, standard pass, wide pass, and filter sets. The composition of these infrared interference filters includes IR substrates such as silicon, sapphire, IR Quartz and germanium etc., alongwith thin films of varying refractive indices and thicknesses. The effect of moving the pass band toward longer wavelengths is achieved by placing the filters on axis as the difference in angle from zero increases path length of the rays. Functionality is enhanced by isolating emission lines by using custom interference band-pass filters. The isolation of laser lines is used to maximize the signal relative to noise ratio.