A5055856118- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Optical Coatings and Gratings
- Crystallography and Radiation Phenomena
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Photonic and Optical Devices
- Photocathodes and Microchannel Plates
- Engineering and Agricultural Innovations
- Laser-induced spectroscopy and plasma
- Optical Polarization and Ellipsometry
- Calibration and Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
- Photorefractive and Nonlinear Optics
- Advanced Electron Microscopy Techniques and Applications
- Geotechnical and Geomechanical Engineering
- Advanced optical system design
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Vibration and Dynamic Analysis
- Advanced Power Generation Technologies
- Radiation Detection and Scintillator Technologies
- Structural Health Monitoring Techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2018-2023
Moscow Institute of Physics and Technology
2016-2021
Russian Academy of Sciences
2020-2021
Moscow Aviation Institute
2019-2021
Moscow Power Engineering Institute
2019-2021
Novosibirsk State University of Architecture and Civil Engineering
2017-2020
Chemnitz University of Technology
2012
We describe a broadband (12.5-30 nm) extreme ultraviolet (XUV) spectrograph, which is stigmatic throughout its operating range. The instrument employs near-normal-incidence aperiodic Mo/Si multilayer mirror and grazing-incidence plane varied line-space (VLS) grating. Strict stigmatism fulfilled simultaneously at two wavelengths the condition of practical over octaves in wavelength. vertically space-resolved line spectra multiple charge ions from laser plasma were recorded to demonstrate...
Abstract This paper is concerned with the history, properties, development, application, and prospects of soft X-ray (2 – 300 Å) VLS spectrometers, i.e., spectrometers reflection diffraction gratings whose spacing varies monotonically across aperture according to a prescribed law (so-called Varied Line-Space (VLS) gratings). An important feature grazing-incidence that spectrum formed on nearly flat surface perpendicular (or slightly inclined) diffracted beams, making them perfectly...
Abstract A flat-field VLS spectrograph for a wavelength range ∼50 – 275 Å with an average linear dispersion of 0.18 mm −1 , which makes use grazing-incidence varied line-space (VLS) grating, was calculated and implemented (a Harada class). To fabricate the grating by interference lithography technique, algorithm developed calculating writing configuration auxiliary aberrating mirror (the solution inverse problem lithography). The put to test line spectra were recorded from laser-produced...
A broadband stigmatic (imaging) soft X-ray (λ > 120 Å) spectrometer is experimentally realised. The optical configuration of the comprises a plane grazing-incidence reflection grating with spacing varying across its aperture according to preassigned law [a so-called varied line-space (VLS) grating] and spherical normal-incidence mirror an aperiodic Mo/Si multilayer structure. average plate scale amounts ∼5.5 Å mm−1. radiation recorded matrix CCD detector (2048 × 1024 pixels size 13 μm). line...
We briefly review the works concerned with development and experimental use of spectral instruments based on aperiodic reflection gratings whose spacing varies monotonically across aperture according to a prescribed law (VLS gratings). The considers employment VLS-grating intended for spectroscopy laboratory astrophysical plasmas, including diagnostics relativistic laser measuring X-ray linewidths, recording high-order harmonics radiation, radiation fast electric discharges other sources, as...
We have analysed the capabilities of flat-field spectrometers with concave VLS reflection gratings from standpoint spectral imaging in soft X-ray range. Two types such instruments are shown to exist: spectrographs as flat possible a portion focal surface (of Harada spectrograph type) and those nearly constant distance grating centre surface, which permits reaching high spatial resolution use crossed focusing mirror (without loss resolution). Three 0.25, 0.5, long type were calculated for...
Broadband Mo/Be multilayer structures were designed for maximum uniform normal-incidence reflectivity in a broad range of 111–138 Å, which lies near and beyond the L 2,3 absorption edge Si. A comparison was made capabilities two classes aperiodic so-called “stack” structures, are composed several periodic with different periods stacked one over other. Six-stack 80-layer synthesized on concave ( R = 1 m) superpolished fused silica substrates. Their absolute measured at 13% – 14% Å...
Three broadband aperiodic Sb/B4C multilayer mirrors were synthesised for the purposes of soft X-ray optics and spectroscopy in wavelength range beyond L-edge Si (λ < 124 Å), their reflection spectra measured. The structures optimised maximum uniform reflectivity ranges 100 – 120 Å, 95 105 Å 90 Å. recorded using a laboratory laser-plasma radiation source an electronic detector with 2D spatial resolution (a CCD matrix 13 × μm sized pixels). experimental are compared theoretical calculations....
Subject of study. The feasibility creating gratings with a spacing that varies on the grating surface according to given law (that is, varied line-space gratings) an average (approximately 600mm−1) and high (up 3000mm−1) groove frequency by interference lithography at argon laser wavelength 488 nm is studied. Aim development high-resolution flat-field spectrographs for vacuum ultraviolet soft X-ray regions spectrum their testing recording line spectra multiply charged ions in plasma goal...
Abstract A family of aperiodic Mo/Be multilayer mirrors was designed for maximum uniform reflectivity in the ranges 111 – 138, 150, 200 and 222 Å at normal radiation incidence. The simulations took into account existence Mo-on-Be Be-on-Mo transition layers. It shown that may be as high 10% an octave wavelength range Å. We demonstrate operation imaging transmission-grating spectrograph with a broadband mirror 138 synthesised Institute Physics Microstructures, RAS. used to record line spectra...
Abstract A flat-field scanning spectrometer/monochromator of the Hettrick – Underwood type is implemented for a wavelength range λ ≈ 50 330 Å. The optical arrangement spectrograph comprises focusing spherical ( R = 6000 mm) mirror, mounted at grazing angle 8.34 °, and grazing-incidence plane varied line-space (VLS) grating operating constant deflection 16.68 °. entrance output slits instrument are immobile, focal distance varies only slightly over its spectral range. short-wavelength...
We propose a broadband single-element monochromator with constant deviation angle and fixed slits for the wavelength range of 3-60 nm, which uses grazing incidence plane varied line-space (VLS) grating exponential dependence line frequency across aperture. Wavelength scanning is performed by translating VLS along its surface. The constant, source, input, output are stationary. With an exit slit (or CCD pixel size) 6 µm, practical resolving power λ/δλ=6000 remains throughout operating range....
Спектрометры для мягкого рентгеновского диапазона на основе апериодических отражательных решёток и их применение, Рагозин Е.Н., Вишняков Е.А., Колесников А.О., Пирожков А.С., Шатохин А.Н.
Gamma rays consist of high-energy photons that selectively interact with nuclei, induce and mediate nuclear reactions elementary particle interactions, exceed x-rays in penetrating power thus are indispensable for analysis modification dense or compressed object interior. Yet, the available gamma sources lack brightness which, if available, would revolutionize science technology. The predicted laser-driven Flash (GF) be highest-power brightest terrestrial source a 30-40% laser-to-gamma...
Aims of research. Studies to determine the effect distance between piles in group with vertical oscillations pile foundations on value dynamic stiffness are carried out and results obtained full-scale tests, within wave model according SP 26.13330.2012 compared. Methods. The eigenfrequency changes foundation nine a diameter ( d ) high cap calculated depending distances - 2 , 3 5 . compared data after series pulse loads performed under semi-natural conditions models. values transverse...
Our intention is to develop high-resolution stigmatic spectral imaging in the XUV (2 – 40 nm). We have designed, aligned and tested a broadband spectrometer for range of 12–30 nm, which makes combined use normalincidence multilayer mirror (MM) (in particular, aperiodic MM) grazing-incidence plane varied linespace (VLS) reflection grating. The concave MM produces slightly astigmatic image radiation source (for instance, entrance slit), VLS grating set its dispersed images. structure...
We present the design, calculations and simulations of high-resolution concave-VLS-grating-based soft X-ray VUV spectrographs, as well a plane VLS grating instrument. have designed normal-incidence imaging spectrograph for 820 – 1690 Å spectral interval series grazing-incidence spectrographs with capabilities. The experimentally recorded images laboratory laser plasmas were obtained aid spectrometer based on concave aperiodic multilayer mirror grating. Two modifications this implemented two...