Open AccessOptically pumped non-zero field magnetometric sensor for the magnetoencephalographic systems using intra-cavity contacted VCSELs with rhomboidal oxide current aperture
Author(s) -
M. A. Bobrov,
S. A. Blokhin,
N. A. Maleev,
A. A. Blokhin,
A. P. Vasyl’ev,
A. G. Kuzmenkov,
A. S. Pazgalev,
М. В. Петренко,
S. P. Dmitriev,
A. K. Vershovskiĭ,
V. M. Ustinov,
I. I. Novikov,
L. Ya. Karachinskiĭ
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1697/1/012175
Subject(s) - magnetometer , materials science , magnetic field , laser , optics , optoelectronics , aperture (computer memory) , physics , quantum mechanics , acoustics
We demonstrate the possibility of using vertical-cavity surface emitting lasers with intracavity contacts and a rhomboidal oxide current aperture for creating compact optically pumped 133 Cs atomic magnetometer operating in non-zero magnetic fields, which is promising to use in magnetoencephalographic systems. The magnetic resonance parameters were studied in a two-beam MX optically pumped magnetic field sensor scheme based on the effect of the magnetic resonance line narrowing at high laser pumping and high concentrations of alkali-metal atoms. The ultimate sensitivity of OPM was estimated by the ratio of the magnetic resonance steepness to the probe light shot noise level. It is shown that a magnetic sensor based on the vertical-cavity surface emitting lasers and a compact (0.125 cm 3 volume) Cs vapor cell can achieve a shot noise-limited sensitivity better than 15 fT in 1 Hz bandwidth. Developed intracavity contacted VCSELs suitable for use in compact atomic magnetometers for magnetoencephalographic systems.