A magnetic field gradient applied to an atom interferometer induces a $M$-dependent phase shift which results in a series of decays and revivals of the fringe visibility. Using our lithium atom interferometer based on Bragg laser diffraction, we have measured the fringe visibility as a function of the applied gradient. We have thus tested the isotopic selectivity of the interferometer, the velocity selective character of Bragg diffraction for different diffraction orders as well as the effect of optical pumping of the incoming atoms. All these observations are qualitatively understood but a quantitative analysis requires a complete model of the interferometer.
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机译：施加到原子干涉仪上的磁场梯度会引起$ M $依赖的相移，从而导致条纹可见度发生一系列衰减和恢复。使用我们基于布拉格激光衍射的锂原子干涉仪，我们已经测量了条纹的可见性，它是所施加梯度的函数。因此，我们测试了干涉仪的同位素选择性，布拉格衍射对于不同衍射级的速度选择特性以及入射原子的光泵浦效应。定性地理解了所有这些观察结果，但是定量分析需要干涉仪的完整模型。
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