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BRAGG FRESNEL OPTICS [1 record]

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Record 1 2010-12-09

English

Subject field(s)
  • Optics
CONT

The interest in Bragg-Fresnel optics is based on their unique properties as dispersive and focusing elements. First successful demonstrations of the Bragg-Fresnel principle were reported in 1984-1986 using multilayer and crystalline substrates… Fresnel lenses have been used at several synchrotron radiation facilities to construct microprobes imaging beam monitors and time-resolved micro-plasma systems.

Key term(s)
  • Bragg Fresnel optics

French

Domaine(s)
  • Optique
CONT

Les optiques dites de Bragg-Fresnel sont d’abord des réflecteurs dont la réflectivité est assurée par une structure épaisse donnant lieu à une réflexion de Bragg (cristal ou multicouche selon la longueur d’onde). La focalisation est obtenue non pas par la forme générale de la structure réfléchissante mais par un réseau diffractant planaire gravé dans la structure réfléchissante. Les optiques de Bragg-Fresnel n’ont pas de concurrent pour l’imagerie haute résolution puisqu’elles permettent d’obtenir des faisceaux submicroniques en dessous du nanomètre en longueur d’onde.

Spanish

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