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Kozhevnikov, I. V.*; Voronov, A. S.*; Roshchin, B. S.*; Asadchikov, V. E.*; Mednikov, K. N.*; Pirozhkov, A. S.; Ragozin, E. N.*; Wang, Z.*; Zhong, Z.*; Wang, F.*
Crystallography Reports, 51(6), p.1075 - 1081, 2006/12
被引用回数：5 パーセンタイル：48.7(Crystallography)Multilayer depth-graded (aperiodic) W/Si and W/B
C mirrors with a period changing over depth have been designed, fabricated, and investigated. The mirrors have almost constant reflectance (from 25 to 35% for different mirrors) at a wavelength of 0.154 nm in a wide range of grazing angles (the reflection bandwidth ranges from 0.25
to 0.4). It is shown that the main reason for the distortions observed on the plateau of the reflection curve is incorrect consideration of the interlayers formed at the interface of neighboring films during fabrication of the structures. The mirrors with sharp interfaces (for example, WSi
/Si) are preferential for practical purposes.
Levashov, V. E.*; Mednikov, K. N.*; Pirozhkov, A. S.; Ragozin, E. N.*
Radiation Physics and Chemistry, 75(11), p.1819 - 1823, 2006/11
被引用回数：17 パーセンタイル：74.53(Chemistry, Physical)We discuss the potentialities of aperiodic multilayer structures for the reflection of XUV radiation, including attooptical applications. Pilot samples of aperiodic normal-incidence broadband focusing multilayer mirrors are employed in a stigmatic transmission grating spectrograph with an operating range of 12.5-30 nm. This spectrograph was used to study (1) the XUV spectra arising from the charge exchange of laser-produced plasma ions with rare-gas (Xe, Kr, He) jet atoms, (2) a debris-free Xe-jet plasma XUV source driven by Nd-laser pulses.
Levashov, V. E.*; Mednikov, K. N.*; Pirozhkov, A. S.; Ragozin, E. N.*
Quantum Electronics, 36(6), p.549 - 552, 2006/06
被引用回数：15 パーセンタイル：60.66(Engineering, Electrical & Electronic)A "clean" (debris-free) pulsed soft X-ray (12.5 - 25 nm) source excited by nanosecond neodymium laser pulses in a pulsed xenon jet was optimised. The source efficiency in the 
nm range is improved due to the weakening of photoabsorption in the peripheral regions of the gas jet in going over to the supersonic regime of xenon gas flow into vacuum, as well as due to the laser beam focusing onto the plateau edge in the radial gas density profile nearest to the observer. The source efficiency at 13.5 nm is 0.22% into a solid angle of 2
sr into a 0.5 nm band.
