scholarly journals Гомодинный квадратурный интерферометр перемещений. Моделирование

2021 ◽  
Vol 129 (10) ◽  
pp. 1306
Author(s):  
Г.Н. Вишняков ◽  
В.Л. Минаев
Keyword(s):  
Experimental Testing ◽  
Vertical Direction ◽  
Optical Scheme ◽  
Matrix Formalism ◽  
Phase Detection ◽  
Optical Elements ◽  
Quadrature Phase ◽  
Interference Signals ◽  
Watt Balance ◽  
Quadrature Signals

In this paper, based on the Jones matrix formalism, we describe the optical scheme of a single-pass homodyne displacement interferometer with a quadrature phase detection principle. The interferometer is built according to the Michelson scheme, and polarizing optical elements are used to obtain quadrature signals with a phase shift of 90°. The interferometer is supposed to be used as part of a new Russian standard of the kilogram based on watt balance for precision measurements of the displacement and speed of the coil in the vertical direction. The results of modeling the optical scheme of the interferometer are considered in order to assess the effect on the measurement accuracy of the imperfection of the polarizing elements and their alignment. An algorithm for correction of nonlinearity arising in the quadratic detection of interference signals is also considered. The results of experimental testing of a homodyne displacement interferometer with a quadrature principle of phase registration are carried out.

Alignment of the aberration-free XUV Raman spectrometer at FLASH

2019 ◽  
Vol 26 (1) ◽  
pp. 18-27 ◽  
Author(s):  
Mykola Biednov ◽  
Günter Brenner ◽  
Benjamin Dicke ◽  
Holger Weigelt ◽  
Barbara Keitel ◽  
...  
Keyword(s):  
Extreme Ultraviolet ◽  
Laser Interferometry ◽  
Grazing Incidence ◽  
Stray Light ◽  
Optical Scheme ◽  
Optical Elements ◽  
X Ray ◽  
Raman Spectrometer ◽  
Optical Alignment

An extreme-ultraviolet (XUV) double-stage Raman spectrometer is permanently installed as an experimental end-station at the PG1 beamline of the soft X-ray/XUV free-electron laser in Hamburg, FLASH. The monochromator stages are designed according to the Czerny–Turner optical scheme, adapted for the XUV photon energy range, with optical elements installed at grazing-incidence angles. Such an optical scheme along with the usage of off-axis parabolic mirrors for light collimation and focusing allows for aberration-free spectral imaging on the optical axis. Combining the two monochromators in additive dispersion mode allows for reaching high resolution and superior stray light rejection, but puts high demands on the quality of the optical alignment. In order to align the instrument with the highest precision and to quantitatively characterize the instrument performance and thus the quality of the alignment, optical laser interferometry, Hartmann–Shack wavefront-sensing measurements as well as off-line soft X-ray measurements and extensive optical simulations were conducted. In this paper the concept of the alignment scheme and the procedure of the internal optical alignment are presented. Furthermore, results on the imaging quality and resolution of the first monochromator stage are shown.

scholarly journals Polarization Changes of Radio Signals in Vertical Radio-Echo Sounding of Glaciers

1975 ◽  
Vol 15 (73) ◽  
pp. 469-470 ◽  
Author(s):  
V. V. Bogorodskiy ◽  
G. V. Trepov ◽  
B. A. Fedorov
Keyword(s):  
Crystal Structure ◽  
Vertical Direction ◽  
Main Method ◽  
Receiving Antenna ◽  
Linearly Polarized ◽  
Radio Echo Sounding ◽  
Radio Signals ◽  
Interference Signals ◽  
Elliptically Polarized ◽  
Made In

An electromagnetic linearly-polarized signal transmitted through the glacier in a vertical direction, reflected from the bedrock, and received with a receiving antenna, is found to be changed into one either partially or elliptically polarized. The polarization changes are believed to be due mainly to the crystal structure of the glacier and anisotropy caused by the pressure of the upper layers. An analysis of the polarization diagrams obtained is up to the present the main method used for studies of the reflected signal polarization. Evidently using a simple dipole a partially-polarized signal is not distinguishable from one that is elliptically polarized, nor is a nonpolarized signal distinguished from circularly polarized. However, the data recently obtained are of great importance, particularly from studies of glacier crystal structure made in deep core drilling. Possible reasons for the polarization changes of the signal have been analysed. Results of the analyses of the polarization diagrams obtained both at individual points and along extended traverses are discussed. It has been found that the signal reflected from a considerable ice thickness is polarized in such a way that the parallel orientation of the receiving and transmitting dipoles can be disregarded. En route recordings of the signal fluctuations obtained by parallel and orthogonally polarized dipoles are shown. The results of polarization studies are important for practical purposes. For example, bedrock relief sounding carried out with crossed dipoles makes it possible to get rid of interference signals occurring due to scattering from inhomogeneous structures of the upper part of the glacier.

Automated Approach to Creation of Optical Design Documentation

2011 ◽  
Vol 6 (4) ◽  
pp. 135-144
Author(s):  
Andrey Kolpakov
Keyword(s):  
Optical Design ◽  
Optical Scheme ◽  
Optical Elements ◽  
Design Documentation ◽  
Interactive Application

This article is devoted to development of automated approach to creation of optical design documentation. The ultimate target is interactive application that able to create optical scheme and working drawings of optical elements by initial computed data

LINEAR OPTICAL IMPLEMENTATION OF DISCRETE QUANTUM FOURIER TRANSFORM WITH CONVENTIONAL PHOTON DETECTORS

2011 ◽  
Vol 09 (01) ◽  
pp. 509-518 ◽  
Author(s):  
HONG-FU WANG ◽  
SHOU ZHANG ◽  
KYU-HWANG YEON
Keyword(s):  
Fourier Transform ◽  
Success Probability ◽  
Optical Scheme ◽  
Quantum Fourier Transform ◽  
Photon Polarization ◽  
Photon Detectors ◽  
Optical Elements ◽  
Two Photon ◽  
Complex Linear ◽  
Linear Optical

We present a linear optical scheme for implementing two-bit discrete quantum Fourier transform based only on simple linear optical elements, a pair of two-photon polarization entangled states, and the conventional photon detectors that only distinguish between the presence and absence of the photons. The scheme can be implemented with a certain success probability, and the implementation of the scheme in experiment would be an important step towards more complex linear optical quantum computation.

QUANTUM TELEPORTATION FROM LIGHT TO ATOMIC BOSE–EINSTEIN CONDENSATE

2010 ◽  
Vol 24 (10) ◽  
pp. 937-944 ◽  
Author(s):  
YU GUO ◽  
RONG-SHENG QU
Keyword(s):  
Coherent State ◽  
Quantum Teleportation ◽  
Coherent States ◽  
Einstein Condensate ◽  
Kerr Medium ◽  
Optical Scheme ◽  
Optical Elements ◽  
Beam Splitters ◽  
Bose Einstein Condensate ◽  
Bose Einstein

An optical scheme of the quantum teleportation of superposed coherent states from light pulse to the atoms in Bose–Einstein condensate in terms of optical elements is presented. Beam splitters, photodetectors, cross-Kerr medium, and coherent state sources are needed in this scheme. The probability of successful teleportation is also obtained.

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