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- Compound_refractive_lens abstract "A Compound refractive lens (CRL) is a series of individual lenses arranged in a linear array in order to achieve focusing of X-rays in the energy range of 5-40 keV.For all materials the refractive index for X-rays is close to 1, hence a single conventional lens for X-rays has an extremely long focal length (for practical lens sizes, on the order of 1 mm). In addition, X-rays attenuate as they pass through a material so that conventional lenses for X-rays have long been considered impractical. The CRL gets its reasonably short focal length, on the order of meters, by using many lenses in series. To minimize the absorption the lens must be made from a material such as aluminium, beryllium, or lithium.CRLs were first demonstrated in the mid-1990s by a group of scientists at the ESRF. They drilled holes in an aluminium block, and achieved focusing in two dimensions. For X-rays a concave lens focuses the X-rays because the index of refraction is slightly below unity. In a CRL of this type the walls between the cylindrical holes act as concave lenses for X-rays traveling perpendicular to the axis of the drilled cylinders. In contrast, for visible light the index of refraction is larger than unity and focusing is done with a convex lens.File:CompoundRL.jpgScientists associated with the ESRF synchrotron have done much of the CRL's subsequent development, notably the parabolic CRLs pioneered by the Aachen group under Lengeler. Their signature material is beryllium: a group at the Advanced Photon Source APS demonstrated the same lenses in lithium. These lenses have a direct counterpart in visible light.The saw-tooth lens is a unique optical scheme suggested and demonstrated by Cederstrom. It approximates a parabolic lens much as a numerical computation on a grid approximates a smooth line, with a series of prisms that each deflect the X-rays over a minute angle. Lenses of this type have been made from silicon, plastic, and lithium.".
- Compound_refractive_lens thumbnail CompoundRL.jpg?width=300.
- Compound_refractive_lens wikiPageExternalLink index.php?option=com_content&view=article&id=46&Itemid=54&lang=en.
- Compound_refractive_lens wikiPageID "21927836".
- Compound_refractive_lens wikiPageRevisionID "590154832".
- Compound_refractive_lens autor "Arndt Last".
- Compound_refractive_lens hasPhotoCollection Compound_refractive_lens.
- Compound_refractive_lens titel "Compound refractive X-ray optics".
- Compound_refractive_lens url index.php?option=com_content&view=article&id=46&Itemid=54&lang=en.
- Compound_refractive_lens zugriff "22".
- Compound_refractive_lens subject Category:X-ray_instrumentation.
- Compound_refractive_lens comment "A Compound refractive lens (CRL) is a series of individual lenses arranged in a linear array in order to achieve focusing of X-rays in the energy range of 5-40 keV.For all materials the refractive index for X-rays is close to 1, hence a single conventional lens for X-rays has an extremely long focal length (for practical lens sizes, on the order of 1 mm). In addition, X-rays attenuate as they pass through a material so that conventional lenses for X-rays have long been considered impractical.".
- Compound_refractive_lens label "Compound refractive lens".
- Compound_refractive_lens label "Составная преломляющая линза".
- Compound_refractive_lens sameAs m.05p64m3.
- Compound_refractive_lens sameAs Q13477886.
- Compound_refractive_lens sameAs Q13477886.
- Compound_refractive_lens wasDerivedFrom Compound_refractive_lens?oldid=590154832.
- Compound_refractive_lens depiction CompoundRL.jpg.
- Compound_refractive_lens isPrimaryTopicOf Compound_refractive_lens.