Development of a Three Axis Accelerator using an Atom Interferometer

使用原子干涉仪开发三轴加速器

• 批准号: 1801496
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1801496
• 关键词: Development; Three; Axis; Accelerator; using

Back in 1991 the first successful realisation of an atom interferometer for measuring gravitational forces was built by Mark Kasevich and Steven Chu [1,2]. Within this type of interferometer, a cloud of atoms (usually sodium or rubidium) are split using two-photon Raman transitions between two hyperfine ground states. The two spatially separated clouds are then reflected and recombined with subsequent Raman pulses. The acceleration, parallel to the Raman beams, that the system undergoes will induce a path difference which amounts to a phase difference between the two atomic wavepackets. This phase difference is a measurable quantity and can be related back to the acceleration via delta-psi =k_eff aT squared, where delta-psi is the accumulated phase difference, k_eff is the effective wavevector for the Raman beams, a is the acceleration of the system and T is the time between Raman pulses. To date, atom interferometers have focused on extreme sensitivity [2 3] or high repetition rate/transportability [4,5] in mind, usually at the expense of each other. With this in mind, we propose to build a three axis accelerometer that balances the trade-off between sensitivity and repetition rate which builds upon our current one axis system. The proposed level of sensitivity is 100ng/Hz with a dynamic operational range of 0.3g and a repetition rate of 10Hz.[1] Kasevich, M. and Chu, S., 1991. Atomic interferometry using stimulated Raman transitions. Physical review letters, 67(2), p.181.[2] Biedermann, G.W., Wu, X., Deslauriers, L., Roy, S., Mahadeswaraswamy, C. and Kasevich, M.A., 2015. Testing gravity with cold-atom interferometers. Physical Review A, 91(3), p.033629.[3] Rosi, G., Sorrentino, F., Cacciapuoti, L., Prevedelli, M. and Tino, G.M., 2014. Precision measurement of the Newtonian gravitational constant using cold atoms. Nature, 510(7506), pp.518-521.[4] Farah, T., Guerlin, C., Landragin, A., Bouyer, P., Gaffet, S., Dos Santos, F.P. and Merlet, S., 2014. Underground operation at best sensitivity of the mobile LNE-SYRTE Cold Atom Gravimeter. Gyroscopy and Navigation, 5(4), pp.266-274.[5] Battelier, B., Barrett, B., Fouché, L., Chichet, L., Antoni-Micollier, L., Porte, H., Napolitano, F., Lautier, J., Landragin, A. and Bouyer, P., 2016. Development of compact cold-atom sensors for inertial navigation. arXiv preprint arXiv:1605.02454.

早在1991年，Mark Kasevich和Steven Chu就首次成功实现了用于测量引力的原子干涉仪[1，2]。在这种类型的干涉仪中，原子云（通常是钠或铷）使用两个超精细基态之间的双光子拉曼跃迁分裂。两个空间分离的云然后被反射并与随后的拉曼脉冲重新组合。平行于拉曼光束的加速，系统将产生一个路径差，这相当于两个原子波包之间的相位差。该相位差是可测量的量，并且可以通过delta-psi = k_eff aT平方与加速度相关，其中delta-psi是累积相位差，k_eff是拉曼光束的有效波矢量，a是系统的加速度，T是拉曼脉冲之间的时间。迄今为止，原子干涉仪一直专注于极端灵敏度[2 3]或高重复率/可移植性[4，5]，通常以牺牲彼此为代价。考虑到这一点，我们建议建立一个三轴加速度计，平衡灵敏度和重复率之间的权衡，建立在我们目前的一轴系统。建议的灵敏度水平为100ng/Hz，动态工作范围为0.3g，重复频率为10Hz。[1]卡谢维奇，M.和Chu，S.，1991.利用受激拉曼跃迁的原子干涉测量法。Physical Review Letters，67（2），p.181. [2]Biedermann，G.W.，Wu，X.，中国农业科学院，Deslauriers，L.，罗伊，S.，Mahadeswaraswamy角和Kasevich，M.A.，2015.用冷原子干涉仪测试重力。Physical Review A，91（3），p.033629. [3]罗西，G.，Sorrentino，F.，卡恰普奥蒂湖Prevedelli，M.和蒂诺，通用汽车公司，2014.利用冷原子精确测量牛顿引力常数。Nature，510（7506），pp.518-521. [4]法拉，T.，Guerlin，C.，Landragin，A.，Bouyer，P.，Gaffet，S.，Dos桑托斯，F.P.和Merlet，S.，2014.移动的LNE-SYRTE冷原子重力仪的最佳灵敏度的地下操作。陀螺仪和导航，5（4），第266 - 274页。[5]Battelier，B.，巴雷特，B，富歇湖，奇歇湖，安东尼-米科利耶湖，Porte，H.，纳波利塔诺，F.，劳捷，J.，Landragin，A. Bouyer，P.，2016.惯性导航用小型冷原子传感器的研制。arXiv预印本arXiv：1605.02454。