Symmetric autobalanced Ramsey interrogation for high-performance coherent-population-trapping vapor-cell atomic clock

被引：65
作者：
Hafiz, M. Abdel [1 ]
Coget, G. [1 ]
Petersen, M. [1 ]
Calosso, C. E. [2 ]
Guerandel, S. [3 ]
de Clercq, E. [3 ]
Boudot, R. [1 ]
机构：
[1] UBFC, FEMTO ST, CNRS, 26 Rue Epitaphe, F-25030 Besancon, France
[2] INRIM, Str Cacce 91, I-10135 Turin, Italy
[3] Sorbonne Univ, LNE SYRTE, Observ Paris, Univ PSL,CNRS, 61 Ave Observ, F-75014 Paris, France
来源：
APPLIED PHYSICS LETTERS | 2018年 / 112卷 / 24期
关键词：
LASER;
D O I：
10.1063/1.5030009
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report a high-performance pulsed coherent population trapping (CPT) Cs cell atomic clock using the implementation of a symmetric auto-balanced Ramsey (SABR) interrogation sequence. The latter method is found to reduce the light-power induced frequency shift by an order of magnitude compared to a previous experiment using a simple auto-balanced Ramsey interrogation. The contribution of this shift to the clock frequency stability is now rejected in the 10(-16) range at 10(4) s averaging time. Additional tricks, including a compensation method to reduce the laser amplitude noise contribution and the generation of novel error signals for local oscillator frequency and phase correction, have been implemented using a FPGA-based digital electronics board in order to improve the clock short-term stability by a of factor 2. The Allan deviation of the SABR-CPT clock, extracted from a selected 3 x 10(4) s-long dataset, is 2 x 10(-13) tau(-1/2) and averages down to the level of 2.5 x 10(-15) at 10(4) s. These results are encouraging to stimulate the development of hot cell CPT-based clocks for industrial, scientific, and instrumentation applications. Published by AIP Publishing.
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页数：5
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