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

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...

AI Technical Summary

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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