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Linear Variable Filters

Photonics Spectra
Jul 2011
Edmund Optics Inc.Request Info
 
Edmund Optics has introduced linear variable filters designed for individual and combined use for maximum versatility. Available in long- and short-pass versions, they are manufactured with an interference coating that is intentionally wedged in one direction, creating a linear shift of the center wavelength across the length of the entire substrate. The shift enables broad filtering capabilities. The short- and long-wave filters work inversely to one another. The former passes light throughout the filter’s length until a blocking band is reached, while the latter blocks light until a transmission band is reached. The blocking and transmission bands may be adjusted by reorienting the filter to the light source. A single linear variable filter can replace an entire filter set, rendering it economical and compact.


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GLOSSARY
blocking
The process whereby blanks are attached to a block in a position for grinding or polishing.
fluorescence
The emission of light or other electromagnetic radiation of longer wavelengths by a substance as a result of the absorption of some other radiation of shorter wavelengths, provided the emission continues only as long as the stimulus producing it is maintained. In other words, fluorescence is the luminescence that persists for less than about 10-8 s after excitation.
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