High-sensitivity magnetic field measurement method based on electron spin magnetic resonance linewidth narrowing

Abstract

The invention discloses a high-sensitivity magnetic field measurement method based on electron spin magnetic resonance linewidth narrowing. The method comprises the following steps: step 1, setting adriving light frequency; step 2, performing electron spin magnetic resonance line width measurement; step 3, optimizing the power of driving light; and step 4, optimizing the electron spin density. The high-sensitivity magnetic field measurement method has the beneficial effect that the optically polarized electron spin ground state low ultrafine energy level is driven by high power; magnetic resonance linewidth narrowing is realized by improving the atomic polarizability, so that the magnetic field measurement sensitivity is improved; and the method is particularly suitable for a high-densityand small-size buffer gas chamber. On the one hand, the consistency of the buffer gas chamber is good, the yield is high, and the high-sensitivity magnetic field measurement method is suitable for engineering application; and on the other hand, the whole volume of the atom magnetometer is greatly reduced by adopting a high-density and small-volume air chamber, so that the atom magnetometer is applied to the hot spot fields of magnetoencephalogram, unmanned magnetic anomaly detection and the like; and the application range of the electron spin magnetic field measurement method is widened.

Description

technical field [0001] The invention belongs to a highly sensitive magnetic field measurement method, in particular to a highly sensitive magnetic field measurement method based on electron spin magnetic resonance line width narrowing, which is applicable to various weak magnetic field measurement fields. Background technique [0002] The measurement of the weak magnetic field signal can be realized by detecting the Larmor precession of the electron spin in the external magnetic field. The atomic magnetometer constructed based on this method has the characteristics of high sensitivity and stable scale factor, and has been widely used in various fields of magnetic field measurement. In recent years, with the development of cutting-edge technologies such as atomic gas chamber micromachining and high-power small-scale semiconductor lasers, driven by the demand for cutting-edge applications such as magnetoencephalography and unmanned magnetic anomaly detection, atomic magnetomet...

AI Technical Summary

Problems solved by technology

However, this measurement method also makes the polarizability of the electron spins lower, and the electron spins are relatively uniformly distributed in each hyperfine energy level

With the increase of electron spin density, the spin-exchange collision relaxation at different hyperfine energy levels in the traditional measurement method increases rapidly, resulting in a significant broadening of the electron spin magnetic resonance linewidth, which limits the sensitivity of magnetic field measurement.

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