Diffraction Limited Performance of Infra Red Fresnel Lenses.
ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (ENGLAND)
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The effect of diffraction on Fresnel lens performance has been calculated. It is shown that the bandwidth of a coherent lens is very narrow. For low cost high aperture light collection, an uncorrected spherical mirror gives better broadband performance at thermal infrared wavelengths. For monochromatic laser applications, on the other hand, the Fresnel lens may offer significant cost advantages over the conventional alternatives.
- Atomic and Molecular Physics and Spectroscopy