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: Aberration of large numerical-aperture gradient-index lenses for optical pickup systems can be corrected with spherical surfaces whose curvatures are chosen corresponding to the measured values of the fourth- and sixth-order refractive-index coefficients.
Abstract: Aberration of large numerical-aperture gradient-index lenses for optical pickup systems can be corrected with spherical surfaces whose curvatures are chosen corresponding to the measured values of the fourth- and sixth-order refractive-index coefficients.
14 citations
01 Dec 1982-Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology
TL;DR: The longitudinal chromatic aberration of corneal facet lenses of the houseflyMusca domestica is measured directly and is shown to agree with that calculated using the thick-lens formulas, the measured lens parameters and the dispersion of the refractive index of the lenses, measured with an interference microscope.
Abstract: The longitudinal chromatic aberration (variation in the position of focus with wavelength) of corneal facet lenses of the houseflyMusca domestica is measured directly. The result is shown to agree with that calculated using the thick-lens formulas, the measured lens parameters and the dispersion of the refractive index of the lenses, measured with an interference microscope. The longitudinal chromatic aberration between the two wavelengths of peak absorption of fly rhabdomeres (360 nm and 495 nm) is about 2.5 μm and comparable to the depth of focus of the lens, assuming the lens to be diffraction limited. Chromatic aberration is therefore expected to have little effect on optical image quality in the fly; in particular the effect on the modulation transfer function at the receptor level and on the angular sensitivity of the rhabdomeres is insignificant.
14 citations
TL;DR: In this article, the authors present an approach to the design of such apochromatic combinations which automatically minimizes the residual chromatic aberration over a specific wavelength range, by combining three lenses made of different materials with properly chosen powers and dispersions.
Abstract: Apochromatic objectives are constructed by combining three lenses made of different materials with properly chosen powers and dispersions. This paper presents a novel approach to the design of such apochromatic combinations which automatically minimizes the residual chromatic aberration over a specific wavelength range.
14 citations
TL;DR: Considering the real pupil curvatures, a new exact sine condition in the presence of spherical aberration is derived and its validity is confirmed by ray traces.
Abstract: Considering the real pupil curvatures, a new exact sine condition in the presence of spherical aberration is derived and its validity is confirmed by ray traces. This sine condition is useful for lens design and lens evaluation.
14 citations
16 Sep 1980
TL;DR: In this article, a table of lens characteristics for lenses of 140 to 190 degree fields is presented comparing image heights, lens diameters, focal length, etc., and it is demonstrated that such lenses generally obey an image height relationship of y =.015F0 (0 is in degrees).
Abstract: Characteristics of wide angle (fish-eye) optical systems having fields of view greater than 100 degrees are discussed. Design problems such as pupil aberration and glass selection are discussed. A table of lens characteristics for lenses of 140 to 190 degree fields is presented comparing image heights, lens diameters, focal length, etc. It is demonstrated that such lenses generally obey an image height relationship of y = .015F0 (0 is in degrees)
13 citations