OPTICAL SYSTEM AND OPTICAL CAMERA WORKING AT FAR-INFRARED WAVEBAND
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United States of America
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Apr 3, 2025
app pub date -
Sep 5, 2024
filing date -
Sep 5, 2024
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Abstract
An optical system and an optical camera working at a far-infrared waveband are provided, the optical system including three optical elements, the three optical elements being, along the optical axis in order from an object side to an image side: a first sulfur refractive lens, a metalens and a second sulfur refractive lens; the first sulfur refractive lens and the second sulfur refractive lens have positive refractive power; each of three optical elements including an object-side surface facing towards the object side and an image-side surface facing towards the image side; the metalens includes a substrate and a plurality of unit cells, and a plurality of nanostructures are set in the unit cells; the optical system satisfies the following condition with a unit of 1/mm:
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