Accession Number : ADA181000

Title :   Diffraction Limited Performance of Infra Red Fresnel Lenses.

Descriptive Note : Memorandum rept.,

Corporate Author : ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (ENGLAND)

Personal Author(s) : Humphreys,R. G.

Report Date : FEB 1987

Pagination or Media Count : 9

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.

Descriptors :   *DIFFRACTION, *FRESNEL LENSES, *INFRARED RADIATION, *LASERS, BROADBAND, COHERENCE, COLLECTION, FREQUENCY, GREAT BRITAIN, LENSES, LIGHT, LIMITATIONS, LOW COSTS, WAVEFORMS

Subject Categories : Optics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE