An optical filter can partially absorb incident light radiation (such as ultraviolet, visible, or infra-red), and may be based on absorption phenomena, such as colour filters.
Athermic filters - transparent to visible light only, reduce the temperature of the light beam, preventing deterioration or damage to the device.
Infrared filters - block visible light, leaving allowing only infrared wavelengths to pass. Particularly suitable for IR anti-theft devices.
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