A5026521497- Advanced X-ray Imaging Techniques
- Laser-Plasma Interactions and Diagnostics
- X-ray Spectroscopy and Fluorescence Analysis
- Crystallography and Radiation Phenomena
- Advanced Electron Microscopy Techniques and Applications
- Advanced X-ray and CT Imaging
- Laser-Matter Interactions and Applications
- Medical Imaging Techniques and Applications
- Advancements in Photolithography Techniques
- Optical measurement and interference techniques
- Ion-surface interactions and analysis
- Advanced Surface Polishing Techniques
- Laser Design and Applications
- Diamond and Carbon-based Materials Research
- Atomic and Molecular Physics
- Semiconductor materials and interfaces
- High-pressure geophysics and materials
- Digital Holography and Microscopy
- Laser-induced spectroscopy and plasma
- Nuclear Physics and Applications
- Advanced Measurement and Metrology Techniques
- Electron and X-Ray Spectroscopy Techniques
- Advanced Materials Characterization Techniques
- Particle Accelerators and Free-Electron Lasers
- Orbital Angular Momentum in Optics
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2014-2024
Technological Institute for Superhard and Novel Carbon Materials
2017
Russian Academy of Sciences
1995-2015
Colorado State University
2008
We have demonstrated near-wavelength resolution microscopy in the extreme ultraviolet. Images of 50 nm diameter nanotubes were obtained with a single ~1 ns duration pulse from desktop-size 46.9 laser. measured modulation transfer function microscope for three different numerical aperture zone plate objectives, demonstrating that 54 half-period structures can be resolved. The combination spatial and high temporal opens myriad opportunities imaging, such as ability to directly investigate...
This review paper summarizes and provides an overview of our recent studies related to two types short-period multilayer X-ray mirrors, W/B 4 C Co/C.It deals with the experimental observation layer intermixing effects how they affect mirror's optical performance.The presents also some examples using fabricated mirrors in focusing imaging experiments at working wavelengths 2.48 nm 4.47 nm.
Abstract The paper presents a general theoretical framework and related Monte Carlo simulation of novel type the X-ray sources based on relativistic Thomson scattering powerful laser radiation. Special attention is paid to linac generators by way two examples: conceptual design for production 12.4 keV photons presently operating source 29.4 photons. Our analysis shows that state-of-the-art accelerator technologies enable build up compact linac-based same imaging diffraction experiments as in...
Abstract At present, ptychography seems to be the most natural and efficient method for approaching diffraction-limited optical resolution. The general setup of a ptychoscope does not contain refracting or focusing elements includes coherent illumination source, translation stage displacement macroscopic object, detector recording transmitted reflected radiation from which is connected computer processing diffractograms. In classical optics, main problem with achieving high spatial...
Achieving optimal design and precise control of the internal structure laser-target materials are primary objectives in various laser physics experiments, particularly generating high flux photon neutron beams. The study low-density poses considerable challenges for X-ray analysis due to their transparency minimal contrast. In this study, obtain clear visualization foams with sparse structures, we used phase-contrast tomography, utilizing a high-quality monochromatic beam from synchrotron...
We deal with the recent progress in fabrication of graded Co/C multilayer mirrors to be used a 21x Schwarzschild objective (SO) operating at wavelengths near 4.5 nm ("carbon window" region). The peak reflectivity flat was measured 14.8% (wavelength 4.48 nm, incidence angle 5 degrees). curves spherical achieved 3%-6%, spectral matching accuracy being Deltad approximately 0.008 (Deltad/d 0.3%). As result SO demonstrates full working aperture (N(A) 0.2) operation total throughput 0.25%.
The extension of the Fresnel integral to tilted objects is studied using both analytical and numerical approaches. Exact solutions parabolic wave equation are used for this purpose. wavefields produced by a beam propagating at an arbitrary angle θ≠π/2 relative object surface investigated. diffraction patterns simulated 1° ≤ θ 10°. It shown that inverse problem can be reduced Fredholm-type equation. Both 2D 3D geometries considered. results may useful as theoretical framework development...
It is proposed to use X-rays with wavelengths in the carbon window region (4.4nm < λ 5nm) order enhance image contrast studies of biological objects.
A new cost-efficient sputter-slice technology for hard x-ray (10-30 keV) Fresnel zone plates fabrication, imposing no limitation to aspect ratio, is proposed. By means of a plasma chemical process, SiO(2)/Si(1-x)Ge(x)O(2) glassy film multilayer structures are deposited on lateral surface silica rod, outermost layers being as thin 100 nm. It has been shown by numerical simulation that x=0.2 germanium fraction, 100-300 microm plate thickness and the number zones about 1000, first order...
Density gradient laser targets with decreasing density or increasing stepwise layers were reported in experimental and theoretical papers on astrophysics modeling, equation-of-state (EOS), shock-wave dynamics studies. The research of smooth is due. experiments gel-catalyst concentration diffusion are discussed for foam formation. We used multi-image X-ray tomography measurement the silica gel layer process its growth. Gel a growing from flat boundary between gel-forming solution catalyst has...
By methods of cross-sectional transmission electron microscopy and small-angle x-ray scattering (λ=0.154 nm ) the influence Ar gas pressure (1 to 4 mTorr) on growth amorphous interfaces in Mo/Si multilayers (MLs) deposited by DC magnetron sputtering is studied. The significant reduction ML period, which evident as a volumetric contraction, observed MLs at where mean-free path for sputtered atoms comparable with magnetron-substrate distance. Some thickness interlayers increase found,...
Abstract Based on the exact solution of Maxwell equations in form a collapsing spherical vector wave specified by an arbitrary function time, we have calculated maximum energy density that can be achieved when focusing extremely short pulses various shapes. It is shown our earlier formula expressing terms spectrum parameters for Gaussian quasi-monochromatic approximately (with accuracy ±40 %) valid main types pulses.
The investigation of destruction processes in composite materials is a current problem for their structural application and the improvement functional properties. This work aimed to visualize changes induced layered carbon fiber reinforced plastics (CFRP) with help synchrotron X-ray microtomography. article presents details destructive early stages deformation polymers under uniaxial stretching, investigated at micro level. Individual elements composite–filaments, parallel bundles,...
This paper deals with the simulation of output beam parameters inverse Compton X-ray Source (ICS). The takes into account main laser and electron beams, such as their pulse shapes, polarization properties well angular energy dispersion electrons. layout presented ICS optical beamline is dedicated to micro-diffraction studies. To maintain axial symmetry beams at different photon energies, monochromator based on a single crystal installed in Borrmann transparency condition.
The paper deals with the recent results of experiments on soft X-ray imaging various carbon-containing objects: biological samples, artificial carbon fibres, graphite slices, etc. working wavelength was chosen to be 4.5 nm due high penetration ability these X-rays in materials. experimental set-up included: laser plasma source (generated 2<sup>nd</sup> harmonics Nd:YAG laser), scandium-based thin-film filter and highly reflective spherical multilayer mirror. Co/C multilayer's reflectivity...
Many practical applications of x-rays lie in the important for society fields medical imaging, custom, transport inspection and security. Scientific besides fundamental research include material sciences, biomicroscopy, protein crystallography. Two types x-ray sources dominate now: conventional tubes electron accelerators equipped with insertion devices. The first are relatively cheap, robust, compact but have low brightness poorly controlled photon spectrum. second generate divergent beams...
The energy density in the center of a collapsing spherical vector beam is found terms its total and far field spectrum. result has simple form for quasimonochromatic Gauss-like pulse. This formula within factor 1.2 holds extremely short pulses with one half cycles.