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- M V Svechnikov, N I Chkhalo, Maxim Toropov, N. N. Salashchenko
- Optics express
- 2015

Circular Zernike polynomials are often used for approximation and analysis of optical surfaces. In this paper, we analyse their lateral resolving capacity, illustrating the effects of a lack of approximation by a finite set of polynomials and answering the following questions: What is the minimum number of polynomials that is necessary to describe a local… (More)

- M V Svechnikov, N I Chkhalo, Maxim Toropov, N. N. Salashchenko, M V Zorina
- Optics letters
- 2015

The possibilities of applying the point diffraction interferometry (PDI) method for the detection of the middle spatial frequency roughness of superpolished optical surfaces are analyzed. The point source used in the experiment is based on a single mode optical fiber with the subwavelength exit aperture size, which is about 0.25 μm. In a numerical aperture… (More)

- D A Gavrilin, Sergey Kuzin, +4 authors Alexander Soloviev
- Applied optics
- 2015

The use of point diffraction interferometry is reported for measuring minutes, on the order of 0.01 arcsec angular movements. The algorithm for determining the angular displacement by the dynamics of the interference pattern is described. We also demonstrate results for applying this method to the study of the linearity and hysteresis of the angular shift… (More)

- N I Chkhalo, A E Pestov, N. N. Salashchenko, Andrey Sherbakov, E V Skorokhodov, M V Svechnikov
- The Review of scientific instruments
- 2015

A compact laboratory proximity soft X-ray microscope providing submicrometer spatial resolution and digital image registration is described. The microscope consists of a laser-plasma soft X-ray radiation source, a Schwarzschild objective to illuminate the test sample, and a two-coordinate detector for image registration. Radiation, which passes through the… (More)

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