The high flux density of synchrotron white beam offers several advantages in X-ray imaging such as higher resolution and signal-to-noise ratio 3D/4D micro-tomography, frame rate real-time transient phenomena, penetration thick dense materials especially at energies. However, these come with additional challenges to beamline optics, camera sample due increased heat load radiation damage, persona...

Micron-sized white light propagation invariant beams generated by a simple and compact fiber device are presented. The all-fiber device is fabricated by splicing a short piece of large-core multimode fiber onto a small-core single mode white light delivery fiber. Because this fiber device offers an inherent spatial coherence, nondiffracting white light beams can be created with a temporally inc...

The main principles and some applications of Bragg-Fresnel multilayer optics are described. An elliptical Bragg-Fresnel multilayer lens (BFML), designed and fabricated in the IMT RAS has been used for Zdimensional focusing of the white X-ray synchrotron beam. For the beam energy of about 12 KeV the spot size checked with the knife edge method was about lpm. As an example of a successful applica...

A light beam hitting the retina produces an excitatory process; however, around the edge of the light beam, sensory cells are inhibited and lose their sensitivity. This combination of stimulation and inhibition produces a discrepancy between the luminance pattern presented to the eye and the brightness pattern that is observed. The black and white Mach bands are the best known distortions of th...

We present a blind multi-detector multi-component spectral matching method for all sky observations of the cosmic microwave background, working on the spherical harmonics basis. The method allows to estimate on a set of observation maps the power spectra of various components present in CMB data, their contribution levels in each detector and the noise levels. The method accounts for the instru...

An in situ optical technique to visualize surface distortions of the first monochromator crystal under synchrotron beam heat loading has been developed and applied to measure surface profiles of multilayer optics under white wiggler beam at the CHESS A2 beamline. Two identical multilayer structures deposited on Si and SiC substrates have been tested. Comparison of the reconstructed 3D heatbump ...

Starting with the Wigner function formulation for beam wave propagation in Hölder continuous non-Gaussian random refractive index fields we show that the wave beam regime naturally leads to the white-noise scaling limit and converges to a Gaussian Markovian model which is characterized the martingale problem associated to a stochastic differential-integral equation of the Ito type. In the geome...

We have fabricated spherical and cylindrical concave micro-mirrors in silicon with dimensions from 20 microm to 100 microm. The fabrication process involves standard photolithography followed by large area ion beam irradiation and electrochemical anodisation in a HF electrolyte. After thermal oxidation the silicon surface roughness is less than 2 nm. We also present a multilayer porous silicon ...