study on sensitivity-related parameters of distributed feedback laser-pumped cesium atomic magnetometer

Abstract

This article reports a distributed feedback (DFB) laser-pumped cesium atomic experimental magnetometer, showing how the sensitivity is influenced by the following 5 kinds of parameters: laser light intensity, laser frequency, radiofrequency intensity, temperature of cesium absorption cell, and the pressure of the buffer gas in the cell. Results of the experiments show that each of the five parameters has some influence on the sensitivity of the magnetometer, especially the laser frequency, radiofrequency intensity, and temperature of cesium absorption cell, which can even improve the sensitivity by 10 times. Recently we have obtained a sensitivity of 2.5 pT/Hz1/2.

Transverse relaxation determination based on light polarization modulation for spin-exchange relaxation free atomic magnetometer

“…Recently, spin-exchange relaxation free (SERF) atomic magnetometers [1][2][3][4] based on the detection of Larmor precession of optically pumped atoms, [5][6][7] have approached subfemtotesla sensitivity. [8] Additionally, higher spatial resolution and non-cryogenic operation make SERF magnetometer enable new applications including the possibility of mapping non-invasively the cortical modules in the brain, [9,10] which has the potential to be an alternative of SQUID magnetometer for biomagnetism.…”

Optically pumped quantum M x – M R magnet

“…[5] After about five decades' development, great progress has been achieved. [6][7][8] The sensitivity of OPQM was demonstrated to be 15 fT/ √ Hz in a spherical cell with a diameter of 7 cm and could reach 10 fT/ √ Hz in the limit of shot noise. [6] Based on the form of a magnetic resonance signal which is associated with the projection of the magnetic moment, general OPQMs are divided into M z magnetometer and M x magnetometer.…”