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IR and Broadband Optics

Photonics Spectra
Nov 2009
Meller Optics Inc.Request Info
 
MellerOptics.jpgIR and broadband optics from Meller Optics Inc. can be made from sapphire and spinel for harsh environments, from germanium for detector and sensor applications, from zinc selenide and -sulfide for laser and forward-looking infrared applications, from calcium- and magnesium fluoride for nonhygroscopic front surface applications, and from silicon for mirrors and reflectors. A variety of antireflection, partial- and total reflective coatings are available, all conforming to MIL-PRF-13830. They are available in planoconvex, -concave and meniscus configurations with λ/4 and λ/10 surfaces and finishes to 10-5 scratch-dig. They can be produced with outer diameters from 1/4 to 6 in., or diagonal with tolerances to ±0.005 in. and thickness to ±0.002.


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GLOSSARY
calcium fluoride
An optical material used in place of crown glass to produce lenses with extraordinary correction of chromatic aberrations. Its high coefficient of thermal expansion and its tendency to absorb moisture limit its range of application.
germanium
A crystalline semiconductor material that transmits in the infrared.
magnesium fluoride
A colorless, crystalline compound whose low refractive index (n = 1.38) makes it effective as a lens antireflection coating when deposited by thermal evaporation in a near vacuum. This process develops a coating that is robust and stable, though only a few molecules thick.
zinc sulfide
A polycrystalline material that transmits in the infrared; it is used as a phosphor in x-ray and television screens.
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