A method and device for improving the signal-to-noise ratio of microwave electric field strength measurement by Zeeman frequency modulation
A technology of electric field strength and signal-to-noise ratio, applied in the field of weak signal detection, can solve problems such as increasing the complexity of the system, and achieve the effect of improving the measurement signal-to-noise ratio and the signal-to-noise ratio
Active Publication Date: 2022-05-20
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES +1
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However, when the electro-optic modulator (EOM) is used for frequency modulation, it often brings residual laser amplitude modulation, which is not desirable, although [Optics Express 25, 8628 (2017)] of the literature system uses feedback to reduce the EOM frequency modulation. Residual laser amplitude modulation, but additional system complexity
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[0026] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0027] refer to figure 1 , figure 1 Schematic diagram of the optical path of the device for Zeeman frequency modulation to improve the signal-to-noise ratio of microwave electric field strength measurement. The device comprises: a first laser 10, a second laser 12, a first dichroic mirror 11, a second dichroic mirror 13, a first reflector 23, ...
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The invention provides a method and device for improving the signal-to-noise ratio of microwave electric field intensity measurement by Zeeman frequency modulation. On the resonant transitions of state 1 and Rydberg state 2, the frequency of the probe light is scanned near the resonant transition frequency of the ground state and the intermediate state, and the spectrum of the probe light after passing through the atomic cell is measured to obtain the Rydberg electromagnetically induced transparent EIT Spectrum of the AT split signal; use the AC magnetic field to modulate the position of the atomic energy level of the sample, and perform frequency modulation on the spectrum; demodulate the spectrum of the AT split signal of the Rydberg electromagnetically induced transparent EIT, and obtain the dispersion-shaped frequency discrimination signal of the EIT-AT split spectrum . The method and device provided by the invention use an alternating magnetic field to modulate the energy level of atoms, which is equivalent to frequency modulation of the spectrum, naturally there is no problem of residual amplitude, and the experimental system is also simpler and more convenient.
Description
technical field [0001] The invention belongs to the technical field of weak signal detection, and in particular relates to a method and a device for improving the signal-to-noise ratio of microwave electric field strength measurement through Zeeman frequency modulation. Background technique [0002] Due to its large electric dipole moment, Rydberg atoms are very sensitive to external fields, and the transition frequency of adjacent Rydberg energy levels is in the microwave band, so they have great application prospects in the measurement of microwave electric field strength and microwave communication. . The Electromagnetic Induced Transparency (EIT) effect is the quantum coherence effect produced by the interaction between atoms and electromagnetic waves, which reduces the absorption of weak probe light at the atomic resonance and even becomes completely transparent. The EIT effect can be used to slow down the speed of light, measure the magnetic field, and store light. A...
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IPC IPC(8): G01R29/12
CPCG01R29/12
Inventor 贾凤东谢锋张剑王飞梅炅钟志萍
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES