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A Realization Method of Differential Detection Coherent Population Trapped Magnetometer

A technology of coherent population trapping and realization method, which is applied to the size/direction of magnetic field, measurement of magnetic variables, measurement devices, etc., can solve the problems of reducing CPT signal amplitude, large signal noise, reducing the number of atoms, etc., to improve the measurement of magnetic field. Accuracy, small size of the device, and the effect of extending the measurement range

Active Publication Date: 2018-07-17
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] The popular scheme has the advantage of being easy to implement a small magnetometer, but it also has some disadvantages: using a single left-handed or right-handed circularly polarized dichroic light to interact with atoms will pump some atoms into a polarized dark state, thus reducing the number of atoms participating in the CPT resonance , to reduce the amplitude of the CPT signal; in the FM light output by the VCSEL, only ±1 sidebands contribute to the CPT signal, and other optical frequency components do not contribute to the CPT signal, and the non-contributing optical frequency components are also detected, resulting in background optical noise of the signal Large; VCSEL output laser power fluctuations cause strong amplitude (AM) noise; VCSEL output laser has a wide bandwidth, and the frequency jitter is converted into amplitude fluctuations through the CPT signal, which generates frequency-amplitude conversion (FM-AM) noise

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  • A Realization Method of Differential Detection Coherent Population Trapped Magnetometer
  • A Realization Method of Differential Detection Coherent Population Trapped Magnetometer
  • A Realization Method of Differential Detection Coherent Population Trapped Magnetometer

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Embodiment Construction

[0027] Referring to the accompanying drawings below, to 87 Rb is used as an example of an experimental atom to describe an embodiment of the present invention.

[0028] A method for implementing a differentially detected coherent population-confined magnetometer, the steps of which are as follows:

[0029] Step 1. The VCSEL and the atomic gas chamber are controlled at 25°C and 50°C respectively, and the magnetic field coil is supplied with a set DC to generate a magnetic field to be measured. The 1mA current and the microwave signal with a frequency of 3.4GHz are coupled through the Bias-Tee to output the VCSEL drive signal, and the VCSEL is driven by the VCSEL drive signal to output frequency-modulated linearly polarized light. Set the output power of the 3.4GHz microwave signal to -2dBm, and apply frequency modulation to the 3.4GHz microwave signal, the modulation frequency is 1kHz, and the modulation depth is 200Hz.

[0030] Step 2. Place an atomic gas chamber controlled ...

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Abstract

The present invention discloses an implementation method for difference detection of a coherent population trapping magnetometer. The method employs the linear polarization polychromatic light outputted by VCSEL and the atom effect in a magnetic field to extract CPT signals by means of an Faraday effect through a difference detection technology so as to effectively inhibit the AM and FM-AM noise generated by laser in signals, eliminate background noise generated by polychromatic light useless optical frequency components, improve the measurement precision of a CPT magnetometer, and extend the detection range of the magnetic field intensity through the difference.

Description

technical field [0001] The invention relates to the field of atomic magnetometers, and in particular to a method for realizing a differential detection coherent population and trapping magnetometer. Background technique [0002] Magnetometers have extremely important applications in the fields of geomagnetic field detection, space physics, and biomedicine. The atomic magnetometer is a device that uses the Zeeman effect of atoms in a magnetic field to reverse the magnetic field information. The miniature atomic magnetometer realized by the CPT phenomenon is only 12mm in size 3 , the power consumption is only 195mW, and the sensitivity can reach 50pT / Hz 1 / 2 . [0003] Energy level Zeeman movement makes the hyperfine energy level split of alkali atoms in the magnetic field change, and 87 Rb atom as an example, according to the Breit-Rabi formula ( is the reduced Planck constant, ω hfs is the frequency difference between the two energy states whose ground state magnetic ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/032
CPCG01R33/0322
Inventor 田原顾思洪张樊
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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