Orbital angular momentum light-driven Sagnac atom interferometer and measurement method

Abstract

The invention discloses an orbital angular momentum light-driven Sagnac atom interferometer and a measuring method. The measuring method comprises the following steps: preparing and loading an initial-state cold atom, performing an orbital angular momentum Raman process, controlling an atomic internal state, and detecting the movement of an atomic coherent stripe; in the Sagnac atom interferometerdriven by orbital angular momentum light, after a cold atomic group is loaded in an annular light field, using laser with opposite orbital angular momentum to operate the atomic group, preparing atoms to reach a required internal state, endowing the atoms with opposite orbital angular momentum, and splitting the atomic group into two beams and then enabling the two beams of the atomic group to move along the opposite directions of the annular light field respectively; enabling the two beams of the atomic group to move for half a cycle to reach the opposite ends, acting pi Raman light at the opposite ends, and exchanging an atomic internal state; moving for one week to return to the initial end, using the laser with the opposite orbital angular momentum again to operate the atomic group, enabling the atoms to return to the same initial internal state, enabling an interference phenomenon to occur, extracting a phase difference from an interference pattern, carrying out analysis and calculation, obtaining the angular momentum of platform rotation, and carrying out precise measurement. According to the invention, the generated loop is higher in stability.

Description

technical field [0001] The invention relates to the technical field of precision measurement, in particular to a Sagnac atomic interferometer driven by orbital angular momentum light and a measurement method. Background technique [0002] With the realization of Bose-Einstein condensate in rarefied gas, the research on the phenomenon of matter-wave interference has become more in-depth. Atom interferometers are initially divided into two types: external state interferometers and internal state interferometers. Matter wave interferometers made on the principle of phase differences caused by different atomic positions are called external state interferometers, and changing the internal energy of atoms It is called an internal state interferometer for interfering atomic matter waves. Of course, other classifications also exist, such as Ramsey-Border atomic interferometers, Raman interferometers with pulsed lasers, and so on. [0003] In 1991, Steven Chu's group at Stanford Un...

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Problems solved by technology

[0004] There are certain technical difficulties in the interferometer and gyroscope solutions mentioned above, and it is difficult to accurately adjust and control the magnetic field structure; compared with the magnetic field, the stable The light field is easier to control, and the ring structure is more stable

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