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Bandpass, Edge Filters

Photonics Spectra
Feb 2011
Research Electro-Optics Inc. (REO)Request Info
REO has launched linearly variable bandpass and edge filters for applications in spectrometry and temperature sensing. In these variable response coatings, the center wavelength of operation changes with position in a linear manner over the surface of the part. In the past, high manufacturing costs for these kinds of filters have limited their use to a few specialized applications. The company’s volume-scalable technology enables cost-effective production of linearly variable filters over a wide range of sizes. Bandpass filters are available for operation in the visible (380 to 760 nm), the near-infrared (600 to 1100 nm) and the mid-infrared (1.3 to 2.6 μm) spectral ranges. Nominal bandwidth is 1% full width half maximum of the center wavelength, with peak transmission of 60% and linearity of ±0.5%. Short- and long-wave-pass edge filters also are available over the same spectral ranges and substrate sizes.


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fused silica
Glass consisting of almost pure silicon dioxide (SiO2). Also called vitreous silica. Frequently used in optical fibers and windows.
optical glass
A glass that, during manufacture, is carefully controlled with respect to composition, melting, heat treatment, and other processing, to render its optical characteristics, such as its index of refraction, dispersion, transmittance, spectral transmittance, homogeneity, freedom from birefringence, permanence, etc., sufficient for its optical application.
The study and measurement of spectra and their components.
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