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IR FILTERS

Photonics Spectra
Apr 2004
Sunex Inc.Request Info
 
IR FILTERS Sunex Inc. has introduced IR-cutoff filters for use with CCD/CMOS color sensors to produce true color images. The precision-polished windows have a dielectric coating to block the transmission of IR radiation while passing the visible spectrum. Cosmetic surface quality specification is better than 20-10 scratch-dig after coating, and defects are <20 µm. Filter thickness is 1.0 mm, and standard size is 15 × 15 mm, with custom sizes available. Dimension tolerance is ±0.1 mm, and surface flatness is ≤3 fringes.


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GLOSSARY
dielectric coating
A high-reflectance coating consisting of alternating layers of quarter-wave film of a higher refractive index and lower refractive index than the substrate. Such coatings can be made very specific to a reflected wavelength or, by varying the layers' thicknesses or film indexes, spread over a wide wavelength interval.
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