Topic
Apochromat
About: Apochromat is a research topic. Over the lifetime, 642 publications have been published within this topic receiving 7934 citations.
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TL;DR: In this paper, it was shown that for lenses of moderate strength, third and fifth order coefficients are numerically very similar for magnetic lenses of the Bell-shaped field type, and that the error is left when third order aberration is corrected.
Abstract: Knowledge of the fifth order spherical aberration of magnetic lenses is required in order to show how much error is left when third order aberration is corrected. This is found theoretically for lenses of the bell-shaped field type. It is found that, for lenses of moderate strength, third and fifth order coefficients are numerically very similar.
1 citations
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TL;DR: In this paper, the principle and design method of employing diffractive optical element to athermalize an infrared optical system are discussed, and an analysis is made on the Diffractive Optical element's dispersion characteristics and its superiority in correcting the second spectrum.
Abstract: The principle and design method of employing diffractive optical element to athermalize an infrared optical system are discussed. An analysis is made on the diffractive optical elements dispersion characteristics and its superiority in correcting the second spectrum. A hybrid infrared optical system,as a practical application example,which has realized apochromatism and works beyond normal temperature, is presented. The parameters of the system are as follows: the focal length is 100mm,relative aperture is 1/2,field of view is 6°,and the working waveband is 8—11μm. In the system,only two materials,namely silicon and germanium, are used. The image quality of the system achieves the diffractive limit within the temperature range of -80—200℃. At about 0.7 aperture,three longitudinal aberration curves of the system intersect at one point,and the apochromatism of the optical system is achieved.
1 citations
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TL;DR: In this paper, a broadband and large aperture apochromatic collimator was designed, which worked in band of 400~1, 000 nm, half field of view was 2.2°, relative aperture F 2.8, and focal length was 135 mm.
Abstract: High accuracy spectral tunable calibration light source is a novel calibration light source,which especially accounts for the stringent calibration requirements of hyper-spectral remote sensors.A broadband and large aperture apochromatic collimator was designed.The lens worked in band of 400~1 000 nm,half field of view was 2.2°,relative aperture F was 2.8,and focal length was 135 mm.According to the corrected formula of parial dispersion(P) and Abbe number(ν),the original optical structure was acquired,based on the principles of apochromatic lens design.The secondary spectrum was corrected well with the help of Zemax software.At last,the lens was apochromatic in the whole working band with secondary spectrum residual of about 0.04 mm,and other aberrations are balanced well.The Lens's MTFs are better than 0.8 at spatial frequency of 37 lp/mm,which meet the requirements of the light source system.
1 citations
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07 Sep 1992
TL;DR: In this article, the relative opening of 3.5 and focal length of 35 mm with a rear shutter, the object-side lens component (L1, L2) being constructed as a composite lens.
Abstract: of EP0537469The lens provided for photographic compact cameras and having the relative opening of 3.5 and the focal length of 35 mm is of the triplet type with a rear shutter, the object-side lens component (L1, L2) being constructed as a composite lens. Four conditions the chromatic coma and the chromatic astigmatism are specified in order to obtain an exceptionally compact design and a balanced monochromatic correction, as well as to reduce the chromatic difference in magnification.
1 citations