Investigation of Kinoform Element Chromatism

The paper investigates the chromatic characteristic of the kinoform element in a given spectral range. Based on the well-known chromatism theory we obtain more exact expressions of the chromatic focus shift and the dispersion coefficient. The enhanced chromatism theory determined that the chromatic focus shift and the dispersion coefficient depend not only on a spectral range but also on a Fresnel zone number. Based on the enahnced theory we analyze the kinoform chromatism in the spectral range of 8–12 µm. We demonstrate that the element focuses the light with design wavelength to a single point, other light – to an uniformly illuminated line. We detect that the dispersion coefficient isn’t a constant, it has different value within each kinoform diffractive zones. Furthermore we analyze the geometry size of a monochromatic spot focused in an imaging region by all Fresnel zones. We propose the method for determining the imaging plane optimal location, in which spot size has minimal value.

Publication year: 
2013
Issue: 
1
УДК: 
535.42
С. 94–98. Іл. 7. Табл. 1. Бібліогр.: 5 назв.
References: 

1. D.C. O’Shea et al., Diffractive Optics: Design, Fabrication, and Test. Washington: SPIE-Press, 2004, 254 p.
2. Micro-optics elements, systems and applications, H.P. Herzig, Ed. London, UK: Taylor and Francis, 1997, p. 359.
3. R.E. Fischer and B. Tadic-Galeb, Optical system design. New York: McGraw Hill, 2000, p. 559.
4. Mann Allen Infrared optics and zoom lenses. Washington: SPIE Press, 2009, p. 166.
5. Колобродов В.Г., Сірий Є.А. Монохроматичні аберації кіноформного елемента // Наукові вісті НТУУ “КПІ”. — 2011. − № 2. — С. 126−129.

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