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Summary form only given. Atom interferometers are expected to be used in various applications, such as precision measurements of inertia force and acceleration of gravity, and of a verification of quantum mechanical phenomena. Conventionally, the method derived by Borde of the evolution matrices of spinors is used to calculate the wave function after interacting with pulses. In order to understand easily the behavior of the interference with various sequences of pulses of a laser beam, we use an analytical method using the geometrical trajectories of the atomic waves. In this method we examine the deflection of atomic trajectory with laser. The amplitude of the interaction with deflections and without deflection is expressed as a function of the pulse area on resonance frequency.