Raman light output device of cold atom interferometric gravimeter with real-time vibration compensation

Abstract

The invention relates to a cold atom interference gravimeter Raman light output device with real-time vibration compensation function, including a laser beat frequency phase-locked loop, an optical output device and a vibration acquisition feedback device; the laser beat frequency phase-locked loop is used The beat frequency of the laser output laser frequency is locked to the frequency difference between the two hyperfine energy levels of the ground state of the alkali metal atom; the optical output device is used to convert the laser output from the laser into a pair of Raman light inputs that meet the requirements of atomic interference into the interference cavity; the vibration acquisition feedback device is used to collect the vibration signal received by the Raman light reflected by the mirror, and perform data processing on it, and finally adjust the locked phase of the laser beat frequency phase-locked loop through feedback to correct the output in real time The phase of the Raman light. In the present invention, through the locking of the laser beating frequency phase-locked loop, the frequency and phase of the laser output from the slave laser can follow the frequency and phase of the laser output from the master laser in real time.

Description

Technical field [0001] The present invention belongs to the field of cold atom interferometer technology, relates to a cold atom interferometer Raman light output device, in particular a cold atom interferometer Raman light output device with real-time vibration compensation function. Background [0002] Cold Atom Interferometer achieves absolute measurement of gravity by laser-controlling alkali metal atoms to achieve absolute measurement of gravity, which has the advantages of high precision, high sensitivity and good long-term stability, and is very suitable for geology, exploration gravity mapping, and long-endurance, far-reaching sea gravity matching navigation accuracy correction without relying on global positioning system (GPS). The general measurement process of the cold atom interferometer is: the alkali metal atom is cooled and imprisoned and purified, and then a pair of Raman light is acted on in the process of its vertical throwing or free falling, so that the moving...

AI Technical Summary

Problems solved by technology

Using a vibration isolation platform will result in a bulky system, and the vibration signal frequency range that the vibration isolation platform can isolate is limited, especially limited by the resonance frequency of the platform itself

The method of fringe phase compensation belongs to post-compensation processing, which is not real-time and cannot realize what you see is what you get, so it is not convenient for the debugging of the gravimetric measurement system and the online monitoring of the measurement process

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