论文标题
轻脉冲原子干涉仪中的速度依赖性相移
Velocity-dependent phase shift in a light-pulse atom interferometer
论文作者
论文摘要
原子干涉法取决于原子波袋的分离和重组。当两条路径在干涉仪的末端完美重叠时，该相对原子速度分布不敏感。在这里，我们表明，当使用拉曼过渡进行分离和重组时，由于光脉冲期间的相移导致原子波袋的位移。由于原子观察到的激光强度的变化，因此这些位移不完善。在干涉仪上观察速度依赖性相位移位是该效应的签名，已被建模。多亏了我们确定的签名，我们能够通过在干涉仪期间应用激光功率坡道来减轻强度变化来弥补这种效果。
Atom interferometry relies on the separation and recombination of atom wavepackets. When the two paths overlap perfectly at the end of the interferometer, the phase is insensitive to the atomic velocity distribution. Here, we show that, when the separation and recombination is performed using a Raman transition there is a displacement of the atomic wavepacket due to a phase shift during light pulses. Because of the variation of the laser intensity seen by the atoms, there is an imperfect cancellation of these displacements. The observation of a velocity-dependent phase shift on the interferometer is the signature of this effect, which has been modeled. Thanks to the signature we have identified, we are able to compensate for this effect by applying laser power ramps during the interferometer to mitigate intensity variations.
