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

Ying Pi; Patrick J. Reardon; David B. Pollock

doi:10.1117/12.666072

18 May 2006 Applying the Buchdahl dispersion model to infrared hybrid refractive-diffractive achromats

Ying Pi, Patrick J. Reardon, David B. Pollock

Proceedings Volume 6206, Infrared Technology and Applications XXXII; 62062O (2006) https://doi.org/10.1117/12.666072
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

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.

Citation Download Citation

Ying Pi, Patrick J. Reardon, and David B. Pollock "Applying the Buchdahl dispersion model to infrared hybrid refractive-diffractive achromats", Proc. SPIE 6206, Infrared Technology and Applications XXXII, 62062O (18 May 2006); https://doi.org/10.1117/12.666072

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