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Bandpass Filters

Photonics MarketplaceECI’s custom proprietary bandpass low loss optical filters are designed and applied using some of the newest and most progressive deposition methods. Bandpass optical filters are available for wide sideband blocking applications for maximum performance from 400nm – 2000nm. Typical out-of-band rejection is 0.01% T (OD 4) or better. ECI’s bandpass optical filters have high transmission levels with low passband ripple; typical peak passband transmission is > 90%. These filters have excellent environmental stability for demanding military and telecommunication applications. High performance bandpass filter coatings are deposited on custom optics, crystals, polymers, fibers, semiconductors, and glass substrates up to 200mm in diameter. Bandpass filters are designed to selectively transmit light over a certain wavelength band while blocking the remaining light in a given spectrum.

Most of the filters that ECI produces are designed using Fabry-Perot cavities or by combining Shortwave Pass (SWP) and Long Wave Pass (LWP) filter coatings. A Fabry-Perot cavity is produced by separating reflective quarter wave stacks by a half wave spacer layer. Reducing the number of quarter wave pairs in each cavity while increasing the number of cavities will result in a bandpass filter with a wider passband. Fabry-Perot filters are designed for use in applications where strict tolerances are required for center wavelength (CW) and bandwidth, typically specified as Full-Width at Half Maximum (FWHM). Applications include fluorescence microscopy, 3D imaging, Gesture Recognition, and Light Detection and Ranging (LIDAR).More products