Atom magnetometer light frequency shift stable control system

Abstract

The invention belongs to the technical field of an atom magnetometer and specifically relates to an atom magnetometer light frequency shift stable control system. Two beams of detection light generated by a detection light module and one of two beams of drive light generated by a drive light module are converged in an atom air chamber. The two beams of detection light extract precession information of atoms in the atom air chamber pumped by the two beams of drive light, thereby realizing independent magnetic field measurement. Photoelectric conversion is carried out on the two beams of detection light, and then the two beams of detection light are input into a phase-locked amplifier A and a phase-locked amplifier B for signal processing. After proportion and integral steps are carried outon output signals of the phase-locked amplifier A and the phase-locked amplifier B, an output frequency of a DDS is set according to the output signal of the phase-locked amplifier A. The DDS drives an exciting coil. The atoms in the atom air chamber are locked at a resonance point. The output frequency of the DDS is locked on a precession frequency of the atoms in real time, thereby realizing outer magnetic field measurement. After the output signal of the phase-locked amplifier B is compared with a set value, the drive light module is controlled, thereby realizing light frequency shift stable control.

Description

technical field [0001] The invention belongs to the technical field of atomic magnetometers, and in particular relates to a stable control system for optical frequency shift of atomic magnetometers. Background technique [0002] In recent years, atomic magnetometers have developed rapidly due to their advantages of high sensitivity, small size, and low power consumption, and have been widely used in many hot fields. Taking the detection of magnetic anomalies as an example, the atomic magnetometer needs to have high sensitivity and high stability at the same time, so it is required to stabilize the noise source of the atomic magnetometer. The use of pumping light to polarize atoms is the premise of atomic magnetometer work. The pumping light irradiating the atomic gas chamber will make the atoms feel a false magnetic field, which is equivalent to introducing a systematic measurement error, which is called optical frequency shift: [0003] [0004] In the formula, B LS is...

AI Technical Summary

Problems solved by technology

[0011] In view of the above prior art, the purpose of the present invention is to provide a stable control system for optical frequency shift of an atomic magnetometer of the present invention, to solve the problem of inaccurate measurement and control of optical frequency shift, and to improve the control accuracy of optical frequency shift

Images