Temporal Atom Optics with a Gravitational Cavity

P. Szriftgiser, M. Arndt, J. Dalibard, P. Desbiolles, D. Guéry-Odelin, A. Steane
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引用次数: 0

Abstract

In thc optical rcgimc, multiplc hcanm interference is a pcrpular method to drastically cnhiincc the resolution of i i n intcrfcrnmctcr. Wc rcport hcrc on the rcalixition of ii multiple bem intcrfcrometcr with niiittcr W;IVCS. An atom is cohcrcntly split into morc than two aloniic wavcpackcts hy optical pumping into a vclocity dcpcndcnt inultilcvcl dark superposition state. The monienta o f two ad.jacent paths diffcr by two photon niomcnta. Whcn the atom is spatially recombined, wc ohscrvc an intcrfercncc signal that shows ;in Airy-function likc pattern characteristic for multiplc hcani interference. This method offers thc prospect o f achieving a very high resolution, since the enclosed arca is larger than that of the corresponding conventional two-beam intcrfcrometcr. For our experimcnt, we usc a cesium atomic beam and two counterpropagating optical hcams in a e-0polarization configuration tuncd to the 6Sln(F=4)-6Pln(F=4) transition of the cesium DI -line. In a first laser pulse, ccsium atonis are optically pumped into a dark superposition of thc five even magnetic ground state sublevels (mr; = -4, -2, .... 4). The momenta of the atoms in these sublevels are 0,2hk, ... ,8hk relative to the momentum of the mF = -4 sublevel (Fig. I ) . The paths spatially separate for a time T, after which a second laser pulse splits each of the five paths further into five. A third pulse at time T after the second pulse closes all partial interferometers. To read out the interferometer, we detect the fluorescence emitted during the final pulse. Typical interferometer signals for T = 5 ps are shown in Fig. 2 as a function of the phase of the final pulse. With no additional phase, the atoms are already in a dark state at this time and no fluorescence is emitted. When the phase is varied, fluorescence can be observed since the atom is not dark any more for the light field. The experimental width of the dip presently is 0.32.2~. which is broader than the theoretical value of 0.18.2~. but clearly narrower than the value 0 . 5 2 ~ observed in a two-beam interferometer. With the use of colder atoms and magnetic shielding a fringe width close to the theoretical value should be possible. For much longer interaction times we expect a washing out of the fringes caused by a recoil phase shift that increases quadratically with the path number. When the total interaction time 2T is an integer multiple of the two-photon recoil energy, a revival of the original fringe pattem OCCUIS.
具有引力腔的时间原子光学
在光学系统中,多波段干涉是一种常用的大幅度提高光学系统分辨率的方法。本文报道了用小W - IVCS校准2个多波长干涉计的研究进展。一个原子通过光泵浦进入一个速度相关的多周期暗叠加态,同时分裂成两个以上的孤子波包。两个人的钱。相邻路径相差两个光子。当原子在空间上重组时,会产生一个干扰信号,该信号显示出类似于多波段干扰的y函数模式特征。这种方法提供了实现非常高分辨率的前景,因为封闭的弧线比相应的传统双光束干涉计的弧线要大。在我们的实验中,我们使用了一个铯原子束和两个在e-0偏振配置下的反传播光学凸透镜来调谐铯DI线的6Sln(F=4)-6Pln(F=4)跃迁。在第一个激光脉冲中,原子铯被光泵送到五个均匀磁基态亚能级(mr;= -4, -2, ....这些亚能级中原子的动量为0,2hk,…,相对于mF = -4亚能级的动量为8hk(图1)。这些路径在空间上分离一段时间T,之后第二个激光脉冲将这五条路径进一步分成五条。在第二个脉冲之后的T时刻,第三个脉冲关闭所有的部分干涉仪。为了读出干涉仪,我们检测在最后一个脉冲中发出的荧光。图2显示了T = 5ps时典型干涉仪信号作为最终脉冲相位的函数。由于没有额外的相位,此时原子已经处于暗态,不会发出荧光。当相位变化时,可以观察到荧光,因为原子在光场中不再是暗的。目前试验的倾角宽度为0.32.2~。这比理论值0.18.2~要宽。但明显比0窄。在双光束干涉仪中观测到。利用较冷的原子和磁屏蔽,条纹宽度接近理论值应该是可能的。对于更长的相互作用时间,我们预计由于后坐力相移引起的条纹洗出,该相移随路径数呈二次增长。当总相互作用时间2T是双光子反冲能量的整数倍时,原始条纹模式就会恢复。
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