Optical device for converging parallel X-ray
An optical device and X-ray technology, which is applied in the field of materials and optics, can solve the problems of poor focusing effect and low transmission efficiency of glass capillary, and achieve the effects of reducing light intensity loss, reducing roughness, and improving transmission efficiency
Inactive Publication Date: 2011-11-02
BEIJING NORMAL UNIVERSITY
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[0003] For glass capillaries, the formula Where k is a proportionality coefficient. In the case of a certain reflective material density ρ, the higher the energy E of X-rays, the smaller the critical grazing angle θ of total reflection, the lower the transmission efficiency of the glass capillary, and the worse the focusing effect. Therefore, the current Glass capillary can only effectively converge X-rays with energy in the range of 0.2 to 40keV
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[0021] In the embodiment of the present invention, the critical grazing angle θ of total reflection is inversely proportional to the energy E of X-rays, and proportional to the square root of the density ρ of the reflective material. At the same time, according to the Waller-Debye formula It can be seen that as the roughness σ of the reflective surface gradually increases, the reflectivity R of X-rays will obviously decrease. Among them, the wavelength λ is inversely proportional to the energy of X-rays. That is to say, the larger the roughness σ is, the worse the effect of effectively converging high-energy X-rays is. An embodiment of the present invention provides an optical device for converging parallel X-rays. While increasing the density ρ of the reflective material, the roughness σ of the reflective surface is reduced, thereby realizing converging parallel high-energy X-rays and filtering out low-energy X-rays at the same time. X-rays.
[0022] see figure 1 , the o...
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Abstract
The invention discloses an optical device for converging and diverging parallel X-ray, which is used for realizing the low-energy X-ray filtering and the parallel high-energy X-ray converging. The optical device comprises a solid component made of glass material, the solid component adopts an axially symmetric structure, one group of opposite sides of a longitudinal cross-section are parallel lines, and the other group of opposite sides are para curves, the opening of which are opposite to each other; a metal film is plated on the side wall of the solid component; one end of the solid component is used for receiving X-ray, and the other end is used for outputting X-ray; a reflecting plane is formed on the critical plane between the glass material and the metal film, and the reflecting plane is used for the X-ray to be totally reflected when the X-ray is transmitted to the reflecting plane in the solid component and to be converged outside the other end.
Description
technical field [0001] The invention relates to the field of materials and optics, in particular to an optical device for converging parallel X-rays. Background technique [0002] X-ray microbeams are usually used for grazing incidence mirrors based on total reflection in X-ray astronomical telescopes and synchrotron radiation beamlines, and their main limitations are extremely small angular receiving aperture, large volume and high cost; Zone plates and crystal or multilayer optical elements based on Bragg diffraction, although not limited by the angular acceptance aperture, are only useful for a narrow wavelength band; while capillary optical elements based on total reflection are just right when used to generate X-ray microbeams It can make up for the above shortcomings, realize wide-angle, broadband transmission, and the cost is low, thus arousing great interest of people. X-ray capillary optics is one of the fastest growing technologies in X-ray optics. The X-ray capi...
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IPC IPC(8): G21K1/06C03C17/06C03C3/091
Inventor 李玉德孙天希林晓燕刘志国潘秋丽罗萍谈国太程琳
Owner BEIJING NORMAL UNIVERSITY