A short-mid-wave infrared wide-band achromatic telescope lens

CN118330859BActive Publication Date: 2026-06-30CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Filing Date
2024-05-21
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing infrared imaging spectrometers suffer from achromatic and astigmatism problems when imaging in the short- to mid-wave infrared bands, making it difficult to achieve high-quality imaging. Furthermore, they lack stability and real-time performance in complex environments.

Method used

A short-to-mid-wave infrared wide-band achromatic telescope head is designed by combining tilting lenses and cylindrical lenses with multi-stage micro-mirrors and pyrogenic materials. Through a compact transmission structure and image-side telecentric design, astigmatism is eliminated and illumination consistency is improved.

Benefits of technology

It achieves achromatic and astigmatism reduction in the short-to-mid-wave infrared broadband band, improving imaging quality and stability, adapting to working requirements in complex environments, and ensuring the accuracy and real-time performance of measured images.

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Abstract

This invention relates to the field of optical technology and provides a short-to-mid-wave infrared broadband achromatic telescope lens. Along the object-to-image direction, it sequentially includes an aperture stop, a first lens, a second lens, a third lens, a fourth lens, a beam splitter, a compensating plate, and a multi-stage micromirror. Incident light passes through the aperture stop, then sequentially through the first lens, second lens, third lens, fourth lens, beam splitter, and compensating plate, before being received by the multi-stage micromirror. The optical path direction is the direction of the incident beam. The first lens is a zero-power tilted lens, the second lens is a negative-power negative meniscus lens, the third lens is a negative-power negative meniscus lens, and the fourth lens is a positive-power biconvex lens. The beam splitter and compensating plate are both 45° tilted flat plates, and are arranged parallel to each other. The entire lens improves the consistency of illumination between the edge and center fields of view, with the edge relative illumination approaching 1, ensuring the accuracy of the spectral information of the measured image.
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