Cold atom gravimeter and detection method

Abstract

The invention discloses a cold atom gravimeter and a detection method, which relate to the technical field of cold atom gravity detection, and aim at solving the technical problem that the sensitivityof an existing cold atom gravimeter is difficult to improve. The method comprises the following steps of preparing a ground-state cold atomic group which vertically moves upwards, applying verticallyupward two-photon stimulated Raman pulses to the ground-state cold atomic group, dividing the ground-state cold atomic group into two cold atomic groups which are in a superposed state and have different speeds, and enabling the two cold atomic groups to be subjected to beam splitting to move on two paths, applying two-photon stimulated Raman pulses to the two cold atomic groups, reversing the internal states of the two cold atomic groups, and transferring momentum, trapping the two cold atomic groups of which the inner states are reversed until the two cold atomic groups fall freely, applying the two-photon stimulated Raman pulse to the two falling cold atomic groups again, and superposing and combining the internal states of the two cold atomic groups, so that the two cold atomic groupsinterfere with each other, and collecting interference fringes of the cold atomic group which generates interference.

Description

technical field [0001] The invention relates to the technical field of cold atom gravity detection, in particular to a cold atom gravity meter and a detection method. Background technique [0002] At present, the cold atom gravimeter is mainly in the gravitational field, based on the principle of matter wave interference, using the relationship between the gravitational acceleration of the cold atomic cluster and the transition probability in the internal state of the cold atomic cluster during the coherent process, to extract the gravitational acceleration information of the position. The two-photon stimulated Raman pulse realizes the beam splitting, deflection and beam combining of cold atomic clusters in the vertical direction, realizes the interference of cold atomic clusters on two paths, and finally extracts the gravitational acceleration from the interference fringes of cold atomic clusters information. [0003] The above scheme can measure the gravitational accelera...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a detection method of a cold atom gravimeter, which is used to improve the total phase of the cold atomic group in the cold atom gravimeter, and solve the technical problem that the sensitivity in the prior art is difficult to improve

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