OPTICS & OPTOELECTRONIC TECHNOLOGY, Volume. 21, Issue 6, 117(2023)
Precision Magnetic Field Control Technology Applied in Cold Atom System
In various cold atomic interferometry systems, MOT, compensation and bias magnetic control are indispensable techniques. The precise manipulation of atomic groups is directly affected by table and fast magnetic field control in the process of atomic cooling, trapping and interference. A set of high-performance precision magnetic field control system is designed in this paper. In circuit topology, the low-noise constant current source based on precision amplifier is used to reduce the noise level of magnetic field driven current. In control mode, analog PID plus disturbance suppression control strategy is adopted to improve the switching speed of magnetic field driven current. The experimental tests are implemented in the laboratory environment. In case of 1 A magnetic field driven current, the opening time is shorter than 300 μs, while the shutdown time is less than 50 μs. Meanwhile, overall current noises are superior to -80 dB at the frequency ranges of DC(0 Hz)~250 kHz. Finally, through experimental tests in cold atom absolute gravimeter/gravity gradiometer and gyroscope, the designed magnetic field control system could meet control requirements of cold atomic interferometry systems and achieve the expected affect. Moreover, its independent development could solve the dependence on commercial magnetic-field control modules, and promote the equipment of quantum measurement devices.
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HUANG Guo-peng, WANG Bin, CHEN Xin-wen, GUO Jie. Precision Magnetic Field Control Technology Applied in Cold Atom System[J]. OPTICS & OPTOELECTRONIC TECHNOLOGY, 2023, 21(6): 117
Received: Mar. 18, 2023
Accepted: --
Published Online: Feb. 29, 2024
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CSTR:32186.14.