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Microwave Electric Field Intensity Meter and Its Measurement Method Based on Cold Rydberg Atom Interferometer

An atom interferometer and cold atom technology, applied in electrostatic field measurement and other directions, can solve the problems of limited measurement accuracy of microwave electric field, such as the width of the transparent window of probe light, and achieve the effect of small probability, narrow natural width, and improved measurement accuracy.

Active Publication Date: 2017-06-20
清远市天之衡量子科技有限公司
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Problems solved by technology

[0003] At present, experimental measurements and theoretical analysis show that the measurement accuracy of microwave electric field based on thermal Rydberg atomic quantum interference effect is limited by the width of the probe light transparent window

Method used

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  • Microwave Electric Field Intensity Meter and Its Measurement Method Based on Cold Rydberg Atom Interferometer

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Embodiment 1

[0037] Such as figure 1 As shown, the microwave electric field intensity meter based on the cold Rydberg atomic interferometer of the present embodiment includes a photodetector 1, a vacuum system 2, a laser 4 and a microwave source 5, and the photodetector 1, the laser 4 and the microwave source 5 launch directions are all towards the vacuum system, where:

[0038] The vacuum system 2 is used to cool the trapped atoms to produce cold atomic groups 3, which is a glass vacuum chamber, and the inside of the glass vacuum chamber is a high vacuum, which reduces the influence of background hot atoms on the cold atomic groups 3 and improves the accuracy of measurement; The cold atomic group 3 is used to prepare the Rydberg state and produce an interference effect, so that the coherent atomic state produces a phase difference; the atom in this embodiment is a rubidium atom (Rb);

[0039] The laser 4 is used to generate coupling light with a wavelength of 480nm and probe light with a...

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Abstract

The invention discloses a microwave electric field strength meter based on a cold Rydberg atom interferometer and a measurement method thereof. The microwave electric field strength meter includes: a vacuum system for cooling trapped atoms to generate cold atomic groups, and the cold atomic groups are used for Preparation of Rydberg state and interference effect, so that coherent atomic state produces phase difference; laser, used to generate coupling light and detection light, to coherently excite cold atoms in the vacuum system from ground state to Rydberg state; photodetector, It is used to detect the interference fringes produced by the coherence of two beams of cold atomic groups; the microwave source is used to generate a microwave electric field. In the evolution process between coherent beam splitting and beam combining, the microwave electric field intensity meter of the present invention allows the atomic groups in the Rydberg state to interact with the microwave electric field to be measured to produce an AC Stark effect, and the microwave electric field strength to be measured Correlated with the phase generated by the AC Stark, the precise measurement of the microwave electric field is achieved.

Description

technical field [0001] The invention relates to a microwave electric field intensity meter and a measuring method thereof, in particular to a microwave electric field intensity meter based on a cold Rydberg atom interferometer and a measuring method thereof, belonging to the technical field of electric field intensity measurement. Background technique [0002] In 2012, the Shaffer research group of Oklahoma University in the United States cooperated with the Pfau research group of Stuttgart University in Germany for the first time to use thermal Rydberg atom EIT and AT splitting to convert the measurement of microwave electric field intensity into optical frequency measurement, and realized the measurement of microwave electric field experimentally. , the minimum electric field strength measured is 8μVcm -1 , the sensitivity is Far superior to the traditional dipole antenna microwave electric field meter. Then in 2013, based on the original experiment, they realized the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/12
Inventor 邓志韬吕庆先梁振涛杜炎雄颜辉黄巍
Owner 清远市天之衡量子科技有限公司
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