High-precision coherent population trapping (CPT) rubidium atom magnetometer

Abstract

The invention discloses a high-precision coherent population trapping (CPT) rubidium atom magnetometer, comprising a VCSEL (vertical-cavity surface emitting laser), a calibrating lens, an electrooptical modulator, a lambda / 2 wave plate, a polarization splitting prism, a reflector, a lambda / 4 wave plate, an ITO heater, an atomic vapor cell, a photoelectric detector, a feedback module, a temperaturecontrol module, a data acquisition module, an upper computer, a circuit control module and a 3.417GHz microwave source. Laser is modulated into left-hand circular polarized light and right-handed circular polarized light which have the same light intensity, the left-hand circular polarized light and the right-handed circular polarized light pass through the atomic vapor cell to generate two CPT signals, the CPT signals are subjected to differential treatment to obtain the Larmor prescession frequency, and finally, accurate measurement to a magnetic field is realized according to the relationbetween the Larmor prescession frequency and the magnetic field intensity. Since a feedback system and the novel atomic vapor cell are added, the magnetometer has the advantages of high precision, high flexibility, low power consumption, small size and the like, and has great significance in terms of biomedicine, physical geography, military detection and the like.

Description

technical field [0001] The invention relates to a high-precision coherent population trapped CPT rubidium atomic magnetometer, which belongs to the technical field of atomic magnetometers. Background technique [0002] In modern technology, magnetic detection technology is widely used. Magnetic field measurement can be used in geophysical research, oil and gas and mineral exploration, military defense, medical diagnosis, geological survey and archaeological research and other fields. Among them, weak magnetic detection is a very important and promising research direction. At present, superconducting quantum interference devices (Superconducting Quantum Interference Device) are mainly used for weak magnetic detection, which has high sensitivity for the measurement of weak magnetic fields, but the magnetometer device is complex, has high requirements for the working environment, and high maintenance costs. Poor universality is not conducive to the research and development of...

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the insufficient sensitivity and absolute accuracy of existing magnetometers, the present invention provides a high-precision CPT rubidium atomic magnetometer, which greatly improves the contrast of CPT signals, can accurately measure the magnetic field, and greatly improves the sensitivity of magnetic field measurement

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