Long-pupillary-distance and shortwave infrared spectral imaging objective lens

Abstract

The invention discloses a long-pupillary-distance and shortwave infrared spectral imaging objective lens. The objective lens comprises five optical lenses which are sequentially arranged on a system optical axis from a light bar to an image surface. An achromatism glass pair with the focal power of positive, negative and negative is formed by the first three optical lenses. A very good achromatism capability is achieved on the short wave infrared outer section through the combination of fluoride glass and dense flint glass, and meanwhile a high spectrum transmittance rate is achieved. The fourth optical lens is used for balancing astigmatism and the curvature of field of the system to increase the view field capability of the imaging objective lens. The fifth optical lens is used for further compensating for the astigmatism of the objective lens and meanwhile is used for meeting the requirement of the imaging objective lens for telecentric performance in image space. Finally, the requirement for the achromatism in the long papillary distance and shortwave infrared band can be met.

Description

Technical field: [0001] The invention relates to an optical imaging objective lens, in particular to a long-pupil distance short-wave infrared imaging objective lens for spectral imaging. Background technique: [0002] Spectral imaging is an imaging detection method that integrates images and spectra. The obtained image data is generally a data cube that contains two-dimensional spatial information and one-dimensional spectral information. [0003] There are three main types of spectral imaging technologies commonly used at present: [0004] The first type of spectral imaging technology uses optical filter technology to obtain spectral data of images; [0005] The second type of spectral imaging technology uses dispersion technology to obtain the spectral data of an image; [0006] The third category is the interference spectral imaging technology using Fourier transform spectroscopy technology. [0007] In particular, the third type of interference spectroscopy imaging t...

AI Technical Summary

Problems solved by technology

[0011] One of the important means of correcting the chromatic aberration of the optical system is to use the different dispersion properties of the optical material to distribute the focal power reasonably. Usually, the transmissive optical system is composed of several lenses with positive and negative focal powers. When performing chromatic aberration correction in the short-wave infrared band, the crown glass with small dispersion is often used as the positive lens, and the flint glass with large dispersion is used as the negative lens. However, the dispersion characteristics of these two types of glasses change in the short-wave infrared band. Realize the correction of chromatic aberration. This method cannot effectively correct chromatic aberration. At the same time, the transmittance of crown glass also decreases between 2200nm and 2500nm, which cannot meet the performance requirements of the optical system. The infrared spectral band must be matched with suitable optical materials and a reasonable structural type to achieve chromatic aberration correction in this band

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