A bandpass filter only allows light in a narrow wavelength range to pass through, commonly known as a Fabry Perot filter, which is essentially a Fabry Perot standard (see Fabry Perot interferometer). The specific structure is as follows: a semi transparent metal layer is coated on a glass substrate, followed by a layer of magnesium fluoride interlayer, and then a semi transparent metal layer is coated. The two metal layers form the two parallel plates of the Fabry Perot etalon. When the distance between the two poles is of the same order of magnitude as the wavelength, the interference peaks of different wavelengths in the transmitted light are very separated. Using other absorption filters can filter out the light that is not allowed to pass through, thus obtaining a narrow passband filter with a much narrower passband width than ordinary absorption filters. In addition, there are Fabry Perot filters with all dielectric materials, two typical structures of which are gHLHLLHH a and gHLHL HH LHLH a1. As needed, the passband of the bandpass filter can range from infrared to ultraviolet. In the visible light range, color television cameras can use this filter to separate images into different colors; In the infrared region, it is commonly used for carbon dioxide lasers, missile guidance systems, and satellite sensors.
Optical specifications:
Center wavelength:; 440nm± three
Bandwidth: 30nm-100nm (any bandwidth can be customized)
Cut off zone: 200nm~400nm, 500nm~1200nm
Minimum transmittance: T>; 92% (customizable according to customer requirements)
Cut off depth: T<; 0.1% (customizable according to customer requirements)
Product materials: quartz, Schott, Corning, colored glass (suitable substrates can be used according to customer requirements to comply with environmental ROHS)
Product size: 80 * 80 * 1.1mm, 86 * 86 * 1.1mm (can be customized according to customer requirements, both square and circular)
Packaging: Dust free and anti-static vacuum packaging
Product Features:
Imported ultra-thin optical glass, with high transmittance, good smoothness, small thickness tolerance, and good flatness, adopts the ion sputtering coating process of imported coating equipment, which has the characteristics of high film hardness, good spectral uniformity, and strong center wave stability. Single piece type does not use laminated glass ultra-thin, the thinnest glass can reach 0.21mm, with a long service life, precise wavelength positioning, ion evaporation, low temperature drift, high penetration rate, and high cut-off depth.
Application fields:
Fluorescence analyzer, enzyme-linked immunosorbent assay (ELISA) reader, cable TV upgrade equipment, wireless transmission equipment, mobile barcode scanning, infrared electronic whiteboard, infrared camera, infrared touch screen, iris recognition, infrared medical instrument, infrared ink recognition, red film recognition, facial recognition sensor system. Handheld infrared laser rangefinder, laser rangefinder, optical instrument, medical and health equipment, and detection instrument.
Spectral curve chart:
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