Feasibility toward a compact high performance coherent population trapping clock

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Feasibility toward a compact high performance coherent

population trapping clock

Peter Yun, François Tricot, Emeric de Clercq, Claudio Calosso, Salvatore

Micalizio, Moustafa Abdel Hafiz, Rodolphe Boudot

To cite this version:

Peter Yun, François Tricot, Emeric de Clercq, Claudio Calosso, Salvatore Micalizio, et al.. Feasibility

toward a compact high performance coherent population trapping clock. International Frequency

Control Symposium and European Frequency and Time Forum, Apr 2019, Orlando, United States.

�hal-02472723�

Feasibility toward a compact high performance coherent population

trapping clock

Peter Yun,

François Tricot,

Emeric de Clercq,

Stéphane Guérandel

LNE-SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ.

Paris 06

61 Avenue de l'Observatoire,75014 Paris, France

yunenxue@ntsc.ac.cn

Claudio Enrico Calosso,

Salvatore Micalizio

Instituto Nazionale di Ricerca Metrologica, INRIM Strada delle Cacce 91, 10135 Torino,

Italy

Moustafa Abdel Hafiz, Rodolphe Boudot FEMTO-ST, CNRS, UBFC 26 chemin de l'Epitaphe, 25030

Besançon, France

Abstract—Atomic clock based on the constructive polarization modulation coherent population trapping, demonstrated a promising performance with frequency stability at the level of 3.2 x 10-13 τ-1/2 up to the averaging time of 100 seconds. The feasibility to implement a compact and high performance CPT clock is discussed.

Keywords—CPT; atomic clock; miniaturization;

Here we demonstrated a high performance coherent population trapping atomic clock based on the constructive polarization modulation configuration [1,2]. In this method, a phase modulation is applied to the two optical components of a bichromatic laser field, synchronously with the polarization modulation, we then defined it as double-modulation (DM) CPT. With careful work parameters investigation and noise suppression, a promising frequency stability at the level of 3.2 x 10-13 τ-1/2 up to the averaging time of 100 seconds is observed [3]. Currently, the short-term stability is mainly limited by the microwave power fluctuation which coupled to the fiber electro-optic phase modulator.

Thanks to DM CPT, in which the polarization modulation frequency for the maximum CPT signal contrast is in the range of several kHz [4], allowing employing a liquid crystal device as the polarization switch. This low voltage driving and negligible size liquid crystal device is an ideal choice to build a very compact and robust setup while maintaining its high performance. The possibility to directly modulate a DFB laser diode with half of Cs ground states hyperfine splitting (~4.6GHz) and miniaturization by micro-optical integration technology are discussed, with the aim to implement an even more compact and high performance CPT clock.

Fig. 1. Allan deviation of the DM-CPT clock.

REFERENCES

[1] Peter Yun, Jean-Marie Danet, David Holleville, Emeric de Clercq, and Stéphane Guérandel, “Constructive polarization modulation for coherent population trapping clock,” Appl. Phys. Lett. 105, 231106(2014). [2] Peter Yun, Stéphane Guérandel, and Emeric de Clercq, “Coherent

population trapping with polarization modulation,” J. Appl. Phys. 119, 244502 (2016)

[3] Peter Yun, Francois Tricot, Claudio Eligio Calosso, Salvatore Micalizio, Bruno Francois, Rodolphe Boudot, Stéphane Guérandel, and Emeric de Clercq, “High-performance coherent population trapping clock with polarization modulation,” Physical Review Applied 7, 01401 (2017) [4] Peter Yun, Sinda Mejri, Francois Tricot, Moustafa Abdel Hafiz,

Rodolphe Boudot, Emeric de Clercq, Stéphane Guérandel, “Double-modulation CPT cesium compact clock,” 8th Symposium on Frequency Standards and Metrology 2015, Journal of Physics: Conference Series 723, 012012 (2016)