Spin-Exchange Broadening of the Magnetic MX Resonance in Cesium

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.

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Методы возбуждения параметрического резонанса в схеме оптического магнитометрического датчика

Журнал технической физики ◽

10.21883/jtf.2021.05.50698.337-20 ◽

2021 ◽

Vol 91 (5) ◽

pp. 840

Author(s):

А.К. Вершовский ◽

М.В. Петренко

Keyword(s):

Magnetic Resonance ◽

Standard Method ◽

Spin Exchange ◽

Experimental Comparison ◽

Pump Light ◽

Low Field ◽

Laser Pumping ◽

Radio Frequency Excitation ◽

Frequency Excitation ◽

Exchange Broadening

An experimental comparison of the methods for modulating the parameters of resonant transverse to the external magnetic field pumping radiation in a two-beam optical magnetometric sensor (so called Bell-Bloom scheme) is carried out, as well as a comparison of these methods with the standard method of radio-frequency excitation of magnetic resonance under conditions of strong laser pumping. It is shown that although the standard method allows one to achieve a greater suppression of the spin-exchange broadening of the magnetic resonance line by pumping light, the Bell-Bloom scheme has advantages that make it possible to obtain similar sensitivity values upon modulation of both the intensity and polarization of the pump light; at the same time, the Bell-Bloom scheme is potentially characterized by higher speed, which is essential for the problems of magnetoencephalography and ultra-low field magnetic resonance imaging.

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

Оптика и спектроскопия ◽

10.21883/os.2021.04.50775.300-20 ◽

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

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