Open AccessИсследование шумовых характеристик вертикально-излучающих лазеров с ромбовидной токовой апертурой для применения в компактном квантовом цезиевом магнитометре
Author(s) -
М.А. Бобров,
С.А. Блохин,
Н.А. Малеев,
А.Г. Кузьменков,
А.А. Блохин,
А.П. Васильев,
М.М. Кулагина,
А.С. Пазгалев,
И.И. Новиков,
Л.Я. Карачинский,
В.М. Устинов
Publication year - 2021
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2021.24.51789.18940
Subject(s) - laser linewidth , relative intensity noise , vertical cavity surface emitting laser , materials science , optics , laser , optoelectronics , semiconductor laser theory , magnetometer , polarization (electrochemistry) , magnetic field , physics , chemistry , quantum mechanics
The possibility of using vertical-emitting lasers with intracavity contacts (IC-VCSEL) and a rhomboidal oxide current aperture for creating a non-zero magnetic field optically pumped atomic magnetometers (OPM) with a 133Cs vapor cell for magnetoencephalographic (MEG) systems were demonstrated. Relative intensity noise (RIN) and polarization resolved RIN of the IC-VCSEL in the 895 nm range with different mirror losses (linewidth) in the frequency range from 1 Hz to 100 kHz were experimentally investigated. Lasers with low mirror loss (narrow linewidth) have polarization resolved RIN comparable to amplitude noise. For IC-VCSEL with an output optical power of 0.8 mW and a linewidth of 55 MHz, the noise level measured is 148 dB/Hz in 1 Hz bandwidth at 40 kHz frequency. The ultimate sensitivity of OPM based on two-beam MX scheme with studied VCSELs was estimated as ~ 11 fT/√Hz.