Optical fiber type CPT atomic magnetometer physical system

Abstract

The present invention provides an optical fiber type CPT atomic magnetometer physical system which comprises a host machine, a first single-mode polarization-maintaining fiber, a fiber polarizer, a second single-mode polarization-maintaining fiber, a fiber 1 / 4 waveplate, an atomic gas chamber, a twisted heating wire, a temperature sensor, a first optical fiber connector, and a third single-mode polarization-maintaining fiber, wherein the host machine comprises a pigtail VCSEL laser, an optical fiber photoelectric detector, a second optical fiber connector and a temperature control unit, the twisted heating wire is wound around the outer surface of the atomic gas chamber, the temperature sensor is arranged at the outer surface of the atomic gas chamber, the twisted heating wire and the temperature sensor are connected to the temperature control unit through temperature control cables, the twisted heating wire is used for generating heat in the atomic gas chamber, and the temperature control unit controls the temperature of the atomic gas chamber through the temperature sensor. According to the system, the difficulty of installing and debugging an optical path is reduced, the stability of outputting a CPT signal is improved, the size is reduced, the power consumption is reduced, and the precision of measuring a magnetic field is improved.

Description

technical field [0001] The invention relates to the technical field of miniature CPT magnetometers, in particular to an all-fiber type CPT atomic magnetometer physical system. Background technique [0002] High-precision magnetic field measurement technology is widely used in many fields, and is playing an increasingly important role in geology, material science, navigation, magnetic anomaly detection, biomedicine, and basic scientific research. There are many types of magnetometers, and different types of magnetometers have different applications according to their characteristics. The atomic magnetometer based on the coherent population trapping principle (Coherent Population Trapping, CPT) has good application potential in many fields because of its unique properties. Because of its absolute measurement scheme and no need for calibration, the magnetometer has a good prospect in navigation and space magnetic survey directions; its all-optical structure and easy miniaturiz...

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Problems solved by technology

This requirement increases the difficulty of installing and debugging the optical path, and affects the stability of the magnetic field measurement of the atomic magnetometer

[0008] 3. When the temperature of the atomic gas cell is constant, in the interaction between light and alkali metal atoms, in order to improve the signal-to-noise ratio of the CPT signal to measure the magnetic field, it is necessary to increase the length of the interaction between light and atoms, because the collimated light It is parallel light. To improve the signal-to-noise ratio, the only way to increase the length of the atomic gas chamber is to increase the volume and power consumption of the atomic magnetometer.

[0009] 4. Since the atomic gas chamber is made by traditional glass blowing technology, a small glass tip must be formed at the sealing port where the alkali metal and buffer gas are injected. The asymmetric structure of the atomic gas chamber will affect the structure of the CPT magnetometer. compactness and stability

[0010] 5. The probe part of the traditional CPT magnetometer contains metal components such as VCSEL lasers and photodetectors. These components will bring residual magnetism, and the residual magnetism of the probe will have a great impact on the magnetic field measurement accuracy of the magnetometer.

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