Definition of absorption lens

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Photonics Dictionary

absorption lens: An absorption lens is a type of optical lens that not only focuses or diverges light but also significantly absorbs certain wavelengths of the incident light. This dual function makes it different from standard lenses that primarily rely on refraction to manipulate light without appreciable absorption.

Selective absorption: The lens material is designed or chosen to absorb specific wavelengths of light while transmitting others. This selective absorption can be used to filter out unwanted wavelengths, such as ultraviolet (UV) or infrared (IR) light, allowing only the desired portion of the spectrum to pass through.

Combination of properties: Unlike purely refractive or purely absorptive elements, an absorption lens combines both properties. It modifies the path of light through refraction and simultaneously attenuates the intensity of certain wavelengths through absorption.

Applications include optical filtering: to block harmful UV or IR radiation while focusing visible light; Laser safety: to protect eyes and sensors by absorbing specific laser wavelengths; and imaging systems: to enhance contrast or reduce glare by filtering out unwanted light.

Material selection: The choice of material for an absorption lens depends on the desired absorption characteristics. Materials like colored glass, certain plastics, or doped crystals can be used to achieve the needed selective absorption.

Design considerations: When designing an absorption lens, factors such as the lens shape, refractive index, and absorption spectrum of the material must be considered to ensure it performs the desired optical and absorptive functions effectively.

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