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Method and device for measuring gravity gradient of pyramid-like atomic interference based on two-dimensional cross gratings

A pyramid structure and atomic interference technology, applied in the field of atomic interferometers, can solve the problems of a large number of optical devices, the increase of system volume, etc., and achieve the effect of high reference value, small size, and suppressing laser phase noise.

Active Publication Date: 2018-06-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The six laser beams of the magneto-optical trap need to install six beam expanders on the vacuum cavity, and a large number of optical devices are required in the optical path, which inevitably increases the volume of the system

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  • Method and device for measuring gravity gradient of pyramid-like atomic interference based on two-dimensional cross gratings
  • Method and device for measuring gravity gradient of pyramid-like atomic interference based on two-dimensional cross gratings
  • Method and device for measuring gravity gradient of pyramid-like atomic interference based on two-dimensional cross gratings

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as figure 1 Shown, the class pyramid structure type atomic interference gravity gradient measurement method based on two-dimensional cross grating of the present invention, its steps are:

[0033] S1: Preparation of cold atomic groups.

[0034] Firstly, pre-cooling is performed by magneto-optical trap and Polarization Gradient Cooling (PGC) to obtain cold atomic groups with a temperature of about 15 μk.

[0035] S2: Speed ​​selection and state preparation.

[0036]By Raman velocity selection, the cluster temperature is further reduced to about 1 μk. The state is prepared in the magnetically insensitive state F=1,m F = 0> up.

[0037] S3: Atom interference.

[0038] Three beams of π / 2, π and π / 2 light pulses are applied to the atomic cluster by two beams of Raman light to realize beam splitting and beam combining of t...

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Abstract

A method and a device for measuring the gravity gradient of pyramid-like atomic interference based on two-dimensional cross gratings are provided. The method comprises the following steps: S1, preparation of a cold atomic group: a cold atomic group is obtained through pre-stage cooling; S2, velocity selection and state preparation: the temperature of the atomic group further decreases through Raman velocity selection, and a state is prepared on a magnetically insensitive state |F=1, mF=0>; S3, atomic interference: PI / 2, PI and PI / 2 light pulses are applied to the atomic group through two beamsof Raman light to realize the splitting and combining of the atomic group, and an atomic interferometer is constructed; and S4, internal state detection: after interference, the atomic group falls freely for a period of time, the number of atomic populations at a hyperfine energy level in two ground states is measured through the effect of probe light, pump light and astigmatic light, and the transition probability and the gravity acceleration value are finally obtained. The device is used to implement the method. The method and the device have the advantages of small overall size, strong robustness, low cost, high measuring accuracy, and the like.

Description

technical field [0001] The invention mainly relates to the field of atomic interferometers, in particular to a method and device for measuring a pyramid-like structure atomic interference gravity gradient based on a two-dimensional cross grating. Background technique [0002] Since the invention of the Michelson interferometer, interferometric instruments constructed based on the diffraction and interference characteristics of light waves have been widely used in basic scientific research, production practice, aerospace, geological prospecting, and national defense industries due to their extremely high measurement accuracy and sensitivity. field. In practice, people gradually realized that the use of shorter wavelength waves for interference can improve measurement accuracy, so an electronic interferometer was built in 1952, and a neutron interferometer was built in 1962. It was not until the 1970s that people began to conceive Atom interferometer. An atomic interferomete...

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Application Information

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IPC IPC(8): G01V7/00
CPCG01V7/00
Inventor 颜树华魏春华杨俊贾爱爱罗玉昆胡青青李期学朱凌晓王恩龙张旭
Owner NAT UNIV OF DEFENSE TECH
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