Dynamics Of Atomic Matter Waves In Atomic Phase Shearing Interferometers Research

Focusing on dynamics of atomic matter waves in atomic phase shearing interferometers,this thesis elaborates the main work during the master's degree from the aspects of the interference principle of atomic matter wave,the interaction between light and atom,the model of atomic point source and the platform control of Raman light reflector.Modeling of atomic phase shearing interferometer has the following several aspects.Firstly,based on the principle of interference fringes of atoms,this thesis calculated and analyzed the interaction of light with atomic matter waves and the stimulated Raman light transition process,by solving the optical Bloch equations to obtain the final state probability of atomic matter waves,using chart method analyze the transition probability of atomic matter waves make atomic matter waves interference process more clear and clear.Secondly,the atomic point source model is established in this thesis,and the density distribution and spatial frequency domain frequency distribution of the atomic point source model are simulated by the atomic point source model,and the atomic matter wave dynamics in the phase shearing interferometer is studied by using the atomic point source model.Thirdly,the difference between the shearing interferometer and the atomic gravimeter is compared,the systematic error of the phase shearing interferometer is analyzed,and the effect of Doppler effect and Coriolis force on the atomic phase is analyzed in detail.My work during my master's degree also includes the Raman reflector platform that this thesis focuses on.At the same time,a set of Raman light reflector platform and a set of micro-displacement measurement experimental device based ontransmission type air-gap laser interference were designed and established in this thesis,and the micro-displacement measurement device was used to accurately measure the micro displacement change of the Raman light reflector platform,with the relative measurement resolution better than 10 nm and the absolute measurement uncertainty better than 5%.In this thesis,the interference pattern hidden in background light,stray light and other interference and noise is extracted by means of a method of calculating the difference of laser intensity distribution before and after the external displacement,and improving the signal-to-noise ratio of the interference signal.On the basis of experiments,the principal component analysis method is used to further image processing,and the main components are separated.