Apochromat

About: Apochromat is a research topic. Over the lifetime, 642 publications have been published within this topic receiving 7934 citations.

2002 IODC design problem: the diffractive simulator

Abstract: The lens design problem for the 2002 IODC is to design a 100 mm focal length, f/8 all refractive system which simulates the chromatic behavior of a diffractive optical element. The lenses must be all spherical and be made of Schott glasses only. There is no restriction on the number of lenses, the design form, or the length of the overall lens. The merit function comprises the rms spot size at a nominal wavelength and the rms of the focal shift differences between the refractive lens and those of the 100 mm, f/8 diffractive optical element. There were forty two entries to the contest; in general, the results were quite good, with most of the spot sizes well below the diffraction limit, and with the rms focal shift differences being much less than 0.001 mm.

Apochromatic lens system

Abstract: The present invention is directed to an apochromatic lens system which is corrected for chromatic aberration at three wavelengths. The apochromatic lens system includes a plane glass and a plane lens which are interchageable with each other. When the plane glass is disposed on the optical axis of a lens system, the plane glass cooperates with the lens system to be corrected for chromatic aberration at the first and second wavelengths. On the other hand, when the plane lens is disposed thereon in stead of the plane glass, the plane lens cooperates with the lens system to be corrected for chromatic aberration at the first wavelength and a third wavelength.

Design of multi-order diffractive THz lenses

Abstract: Quadratic, multi-order diffractive lenses have been designed, fabricated, and demonstrated for the MMW-THz region, with the capability of focusing harmonic wavelengths on to a common focal point. Design wavelength and harmonic spacing can be chosen as design parameters, allowing great flexibility in lens design. Simulations were carried out to determine lens parameters and performance. These lenses reduce both spherical and chromatic aberrations at harmonic wavelengths, and are thinner and lighter than traditional refractive elements. This lens type is potentially useful to sensor fusion architectures.

Apochromatic lens system for relaying laser beam waists

Abstract: A lens system comprises a plurality of lens elements including at least one positive power lens element and at least one negative power lens element, the plurality of lens elements having radii of curvature, thicknesses, indices of refraction, Abbe V numbers and partial dispersion coefficients so as to provide in combination (i) magnification M so that 5

Further Considerations on the Selection of Optical Glasses in Apochromats

Abstract: An analytical proof for the method developed by the author [ N. v. d. W. Lessing , J. Opt. Soc. Am.47, 955 ( 1957)] for the choice of glasses of an apochromatic system consisting of three lenses in contact with each other is given. Variation of the powers with small changes in the coordinates representing the glasses is discussed and it is found that the optical constants of the glasses must be determined accurately (to ±0.000005 or better) for the selection of the best glasses. It is also shown how four glasses can be used to advantage in an apochromat. Finally the extension of the method to an apochromatic system which consists of three lenses separated by air spaces, is considered briefly.