Broadband x-ray optical elements based on aperiodic multilayer structures

被引:33
作者
Kolachevskii, NN [1 ]
Pirozhkov, AS [1 ]
Ragozin, EN [1 ]
机构
[1] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 117924, Russia
关键词
D O I
10.1070/QE2000v030n05ABEH001736
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
An investigation was made of the potentialities of aperiodic multilayer structures (AMSs) optimised to obtain a preassigned reflection spectrum in the x-ray range (lambda < 300 Angstrom) and also starting from other criteria. It was found that among the multitude of realisations of AMSs there exist those which are superior to the regular structure in width of the operating range, integral reflectivity, and peak reflectivity. New types of x-ray optical elements are proposed on a basis of AMSs. AMSs were derived which possess a constant normal-incidence reflectivity R at normal incidence throughout the 130-190 Angstrom (R = 24%), 130-300 Angstrom (R = 15%), etc., ranges. We found AMSs which possess a high polarising power (polarisance) and a constant ii in a broad wavelength range for a fixed angle of incidence. AMSs possessing several isolated reflection peaks which are not Bragg peaks of one another, were calculated. AMSs intended for operation in the hard x-ray range at grazing incidence of radiation were optimised. The technique elaborated in our work was demonstrated to be efficient for optimising AMSs with a very large (similar to 10(3)) number of layers.
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收藏
页码:428 / 434
页数:7
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