scholarly journals Трехуровневое приближение при расчете параметров оптически детектируемого магнитного резонанса в условиях сильной лазерной накачки

2021 ◽  
Vol 129 (4) ◽  
pp. 462
Author(s):  
А.К. Вершовский ◽  
М.В. Петренко
Keyword(s):  
Ground State ◽  
Optical Pumping ◽  
Spin Exchange ◽  
Dense Medium ◽  
Alkali Atoms ◽  
Atomic Medium ◽  
Speed Up ◽  
Partial Suppression ◽  
Optically Detected ◽  
Exchange Broadening

An algorithm is proposed for the approximate solution of a purely nonlinear problem of the parameters of optically detected magnetic resonance in the ground state of alkali atoms in an optically dense medium under conditions of intense narrow-band optical pumping, which causes, first, bleaching of the atomic medium, and, second, partial suppression of spin-exchange broadening. The direct solution of the Liouville equation under these conditions is complicated by the fact that the relaxation time of each of the levels of the hyperfine and Zeeman structure of the ground state is determined by the populations of the remaining levels, which leads to the necessity of solving a self-consistent problem in a multilevel system, and, as a rule, requires the use of supercomputers. In this paper, approximations are proposed that make it possible to significantly simplify and speed up the calculation by orders of magnitude, and the results are compared with experimental data using the example of a two-beam Mx scheme of a magnetometric sensor

scholarly journals Спин-обменное уширение магнитного M-=SUB=-X-=/SUB=--резонанса в цезии

2021 ◽  
Vol 47 (8) ◽  
pp. 51
Author(s):  
А.К. Вершовский ◽  
С.П. Дмитриев ◽  
М.В. Петренко
Keyword(s):  
Magnetic Resonance ◽  
Cross Section ◽  
Ground State ◽  
Resonance Line ◽  
Measurement Errors ◽  
Spin Exchange ◽  
The Cross ◽  
Exchange Broadening

The paper presents the results of measuring the cross section of the spin-exchange broadening of the magnetic resonance line in the Zeeman structure of the ground state of cesium. The analysis of the influence of measurement errors of parameters on the result was carried out, the values of the concentration of cesium vapors were refined by independent measurements.

Magnetoencephalography Using Optically Pumped Magnetometers

2020 ◽  
pp. 104-124 ◽  
Author(s):  
Elena Boto ◽  
Niall Holmes ◽  
Tim M. Tierney ◽  
James Leggett ◽  
Ryan Hill ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Optical Pumping ◽  
Spin Exchange ◽  
Dynamic Range ◽  
Cryogenic Cooling ◽  
Local Magnetic Field ◽  
Optically Pumped ◽  
Fundamental Building Block ◽  
Alkali Atoms ◽  
Theoretical Sensitivity

This chapter explores one of the most promising alternatives to superconducting quantum-interference devices (SQUIDs) as the fundamental building block of magnetoencephalography (MEG) systems: optically pumped magnetometers (OPMs). OPMs exploit the spin properties of alkali atoms, using a technique known as optical pumping to prepare a gas of atoms such that its opacity to laser light becomes a sensitive marker of a local magnetic field. The theoretical sensitivity of the OPM surpasses even that of the SQUID, and OPMs operate without cryogenic cooling. Moreover, they are small and lightweight, offering the potential for development of a flexible MEG system, which could be adapted to any head shape and in principle could become wearable such that subjects could move freely during data acquisition. Because the external surface of an OPM is at approximately body temperature, the sensing volume can be placed close to the head, increasing the signal strength. When operated in the spin exchange relaxation-free (SERF) regime, their bandwidth is suited to MEG acquisition, and their dynamic range, although limited, is acceptable.

Optisches Pumpen an Mangan

1971 ◽  
Vol 26 (10) ◽  
pp. 1567-1570
Author(s):  
A. Assfalg ◽  
J. Fricke ◽  
J. Haas ◽  
R. Tilgner ◽  
E. Lüscher
Keyword(s):  
Ground State ◽  
Optical Pumping ◽  
Spin Exchange ◽  
Light Transmission ◽  
Polarized Light ◽  
Optically Pumped ◽  
Absorption Probabilities

Abstract The 6 S5/2 ground state of Mn 55 was polarized by spin exchange collisions with an optically pumped Cs-vapour. The rf induced transitions between Zeeman subleves of Mn were detected as a change in the Cs pumping light transmission. To estimate the effectiveness of direct optical pumping or of detection with resonance light the absorption probabilities for circlarly polarized light are given as functions of 〈Sz〉.

A Solid-State Near-IR Laser for Spin-Exchange Optical Pumping

2020 ◽  
Vol 84 (11) ◽  
pp. 1359-1361
Author(s):  
A. A. Antipov ◽  
A. G. Putilov ◽  
A. V. Osipov ◽  
A. E. Shepelev
Keyword(s):  
Solid State ◽  
Optical Pumping ◽  
Spin Exchange ◽  
Spin Exchange Optical Pumping ◽  
Near Ir ◽  
Ir Laser

Optical Pumping between Levels of a Bistable State of Alkali Atoms Trapped in Rare-Gas Matrices

1979 ◽  
Vol 43 (6) ◽  
pp. 435-438 ◽  
Author(s):  
L. C. Balling ◽  
J. F. Dawson ◽  
M. D. Havey ◽  
J. J. Wright
Keyword(s):  
Optical Pumping ◽  
Rare Gas ◽  
Alkali Atoms ◽  
Bistable State

scholarly journals Production of C4+ (2s2p 3,1P) hollow states in collisions of 6-18 MeV C4+ (1s2, 1s2s 3S) mixed-state beams with gas targets

2019 ◽  
Vol 26 ◽  
pp. 133
Author(s):  
A. Laoutaris ◽  
I. Madesis ◽  
E. P. Benis ◽  
T. J. M. Zouros
Keyword(s):  
Ground State ◽  
Collision Energy ◽  
Spin Exchange ◽  
Electron Excitation ◽  
Target Species ◽  
Zero Degree ◽  
Excitation Mechanisms ◽  
Gas Targets ◽  
Ar Gas

Normalized electron yields of the formation of 2s2p 3,1P states from the metastable states 1s2s 3,1S and from the ground state 1s21S were obtained in 6-18MeV C4+ collisions with H2, He, Ne and Ar gas targets. The method of zero-degree Auger projectile spectroscopy was used to detect electrons emitted in the Auger decay C4+ (2s2p 3,1P) → C5+ (1s) + e-with high resolution. These states are of particular importance in the detailed study of fundamental excitation mechanisms, i.e. electron-nucleus excitation, electron-electron excitation and electron-electron excitation with spin exchange. Currently, the role of the above mechanisms in the production of the 2s2p 3,1P states is investigated utilizing variable 1s2s 3S metastable fraction beams as a function of collision energy and target species. Our latest results are presented.

scholarly journals Xe129 -Rb Spin-Exchange Optical Pumping with High Photon Efficiency

2018 ◽  
Vol 121 (15) ◽  
Author(s):  
G. Norquay ◽  
G. J. Collier ◽  
M. Rao ◽  
N. J. Stewart ◽  
J. M. Wild
Keyword(s):  
Optical Pumping ◽  
Spin Exchange ◽  
Spin Exchange Optical Pumping
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