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Title: Efficient lensing element for x-rays. [Blazed Fresnel Phase Plate]

Abstract

An efficient x-ray lens with an effective speed of order less than approximately f/50 for lambda greater than approximately 10 A x-rays is described. Fabrication of this lensing element appears feasible using existing microfabrication technology. Diffraction and refraction are coupled in a single element to achieve efficient x-ray concentration into a single order focal spot. Diffraction is used to produce efficient ray bending (without absorption) while refraction is used only to provide appropriate phase adjustment among the various diffraction orders to insure what is essentially a single order output. The mechanism for ray bending (diffraction) is decoupled from the absorption mechanism. Refraction is used only to achieve small shifts in phase so that the associated attenuation need not be prohibitive. The x-ray lens might be described as a Blazed Fresnel Phase Plate (BFPP) with a spatially distributed phase shift within each Fresnel zone. The spatial distribution of the phase shifts is chosen to concentrate essentially all of the unabsorbed energy into a single focal spot. The BFPP transforms the incident plane wave into a converging spherical wave having an amplitude modulation which is periodic in r/sup 2/. As a result of the periodic amplitude modulation, the BFPP will diffract energymore » into foci other than the first order real focus. In cases of small absorption such effects are negligible and practically all the unabsorbed energy is directed into the first order real focus.« less

Authors:
;
Publication Date:
Research Org.:
California Univ., Livermore (USA). Lawrence Livermore Lab.
OSTI Identifier:
5228445
Report Number(s):
UCRL-79966; CONF-770821-4
TRN: 78-006150
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: EMSA meeting, Boston, MA, USA, Aug 1977
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; FRESNEL LENS; DESIGN; X-RAY EQUIPMENT; BEAM OPTICS; COLLIMATORS; DIFFRACTION; FOCUSING; LASERS; REFRACTION; COHERENT SCATTERING; LENSES; SCATTERING; 440300* - Miscellaneous Instruments- (-1989)

Citation Formats

Ceglio, N M, and Smith, H I. Efficient lensing element for x-rays. [Blazed Fresnel Phase Plate]. United States: N. p., 1977. Web.
Ceglio, N M, & Smith, H I. Efficient lensing element for x-rays. [Blazed Fresnel Phase Plate]. United States.
Ceglio, N M, and Smith, H I. Fri . "Efficient lensing element for x-rays. [Blazed Fresnel Phase Plate]". United States. https://www.osti.gov/servlets/purl/5228445.
@article{osti_5228445,
title = {Efficient lensing element for x-rays. [Blazed Fresnel Phase Plate]},
author = {Ceglio, N M and Smith, H I},
abstractNote = {An efficient x-ray lens with an effective speed of order less than approximately f/50 for lambda greater than approximately 10 A x-rays is described. Fabrication of this lensing element appears feasible using existing microfabrication technology. Diffraction and refraction are coupled in a single element to achieve efficient x-ray concentration into a single order focal spot. Diffraction is used to produce efficient ray bending (without absorption) while refraction is used only to provide appropriate phase adjustment among the various diffraction orders to insure what is essentially a single order output. The mechanism for ray bending (diffraction) is decoupled from the absorption mechanism. Refraction is used only to achieve small shifts in phase so that the associated attenuation need not be prohibitive. The x-ray lens might be described as a Blazed Fresnel Phase Plate (BFPP) with a spatially distributed phase shift within each Fresnel zone. The spatial distribution of the phase shifts is chosen to concentrate essentially all of the unabsorbed energy into a single focal spot. The BFPP transforms the incident plane wave into a converging spherical wave having an amplitude modulation which is periodic in r/sup 2/. As a result of the periodic amplitude modulation, the BFPP will diffract energy into foci other than the first order real focus. In cases of small absorption such effects are negligible and practically all the unabsorbed energy is directed into the first order real focus.},
doi = {},
url = {https://www.osti.gov/biblio/5228445}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {8}
}

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