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Proceedings Paper

Applying the Buchdahl dispersion model to infrared hybrid refractive-diffractive achromats
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Paper Abstract

The Buchdahl dispersion model provides a rapidly converging polynomial form for describing the dispersion of refractive materials. Via this model, the dispersion of a material over the waveband of concern can be accurately characterized by a simple polynomial form, often out to only the second order. In this paper, the Buchdahl model is applied to hybrid refractive-diffractive achromats for both 3-5μm (MWIR) band and 8-12μm (LWIR) band. For each waveband, Buchdahl dispersion coefficients of IR materials and the diffractive optical element (DOE) are defined by optimally choosing the Buchdahl chromatic coordinate and best-fitting the Buchdahl model to the dispersion of materials and the DOE. The principles for selecting 1 to 2 IR materials combined with a DOE to produce hybrids achromatized at 3 and 4 wavelengths are discussed. A series of thin lens predesign examples are presented.

Paper Details

Date Published: 18 May 2006
PDF: 10 pages
Proc. SPIE 6206, Infrared Technology and Applications XXXII, 62062O (18 May 2006); doi: 10.1117/12.666072
Show Author Affiliations
Ying Pi, Univ. of Alabama in Huntsville (United States)
Patrick J. Reardon, Univ. of Alabama in Huntsville (United States)
David B. Pollock, Univ. of Alabama in Huntsville (United States)


Published in SPIE Proceedings Vol. 6206:
Infrared Technology and Applications XXXII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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