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For Compactness and Ruggedness, Linear Variable Filters Fit the Bill

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Innovations in design and scalable manufacturing have led to the development of linear variable filters that cover a broader wavelength range than ever before.

TREY TURNER, ERIC BALTZ and ROGER KIRSCHNER, RESEARCH ELECTRO-OPTICS INC.

Spectroscopic optical applications have conventionally utilized dispersive elements such as diffraction gratings and, less commonly, prisms to separate light into its constituent wavelengths for spectral interrogation. Gratings have the advantage in that a wide range of dispersion levels is made available by adjusting the grating pitch, and they can be used in ways that are light-efficient. However, as they disperse the light as a function of angle, they intrinsically require a fairly complex geometry and a relatively large footprint to allow the dispersion of light across a detector. For...Read full article

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