Diffraction Limited Performance of Infra Red Fresnel Lenses.
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1987
- Accession Number
- ADA181000
Entities
People
- R. G. Humphreys
Organizations
- Royal Signals and Radar Establishment