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Photonics Spectra
Oct 2003
Tower Optical Corp.Request Info
Tower Optical Corp. Tower Optical Corp. has released a line of achromatic wave plates that cover the 465- to 610-nm, 700- to 1000-nm and 1200- to 1650-nm wavelengths, ranging from the visible to the IR. They have a clear aperture of 11.5 mm and are available, in all ranges, for both λ/4- and λ/2 retardation. Air-spaced versions are standard, and a cemented version is available by special order. The company says that the wave plates, fashioned out of crystal quartz and magnesium fluoride, maintain nearly constant retardation over the covered spectral range.


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crystal quartz
The naturally occurring crystalline form of silicon dioxide. It is slightly birefringent and exhibits rotary dispersion of light rays transmitted along the crystal axis, both right-hand and left-hand forms being known. Quartz transmits light from about 1800 A to 4.5 µm in the infrared. It is very hard and takes a high polish, and has a low thermal expansion coefficient.
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.
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