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  • Linear Variable Filters

Jul 2011
Edmund Optics Inc.Request Info
Edmund Optics has introduced linear variable filters for individual and combined use. Available in long- and short-pass versions, they feature an interference coating that is wedged in one direction, creating a linear shift of the center wavelength across the length of the entire substrate, enabling 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. Combined filters can be used as a single variable excitation filter for fluorescence applications using white-light sources.


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The process whereby blanks are attached to a block in a position for grinding or polishing.
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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