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Tunable dual-frequency laser source for coherent population trapping atomic clocks

Fabiola A. Camargo, Ghaya Baili, Loïc Morvan +6 more

Jan 1, 20120 citations

Tunable dual-frequency laser source for coherent population trapping cesium atomic clocks

Daniel Dolfi, Stéphane Guérandel, Fabiola A. Camargo +6 more

Coherent population trapping (CPT) has been demonstrated as an interesting technique for miniature atomic frequency references [1,2] and quantum information. It is based on the coupling of the two hyperfine ground states of an alkali atom – namely cesium (133Cs) for atomic clocks – through excitation to a common atomic level by two phase-coherent laser fields nearly resonant with the atomic transitions. The frequency difference between the two laser fields is tuned at the atomic frequency splitting in the microwave range, equal to 9.192 GHz for 133Cs atoms. Outputs powers in the mW range and narrow-linewidth emission (<500 kHz) are required for the two laser beams.Coherent population trapping (CPT) has been demonstrated as an interesting technique for miniature atomic frequency references [1,2] and quantum information. It is based on the coupling of the two hyperfine ground states of an alkali atom – namely cesium (133Cs) for atomic clocks – through excitation to a common atomic level by two phase-coherent laser fields nearly resonant with the atomic transitions. The frequency difference between the two laser fields is tuned at the atomic frequency splitting in the microwave range, equal to 9.192 GHz for 133Cs atoms. Outputs powers in the mW range and narrow-linewidth emission (<500 kHz) are required for the two laser beams.

International Conference on Space Optics (ICSO)Jan 5, 20180 citations

Advances in Coherent Population Trapping for Atomic Clocks

Vishal Shah, John E. Kitching

Advances in atomic, molecular, and optical physicsJan 1, 201080 citations

Compact atomic clock based on Coherent Population Trapping

François Tricot, Peter Yun, Stéphane Guérandel +1 more

Oct 25, 20170 citations

Frequency Shifts in a Coherent Population Trapping Cs Vapor Cell Atomic Clock

Juliette Breurec, Moustafa Abdel Hafiz, Claudio Eligio Calosso +2 more

We report on measurements of frequency shifts in a microwave cesium vapor cell atomic clock based on coherent population trapping (CPT). The dependence of the clock frequency on numerous experimental parameters, such as the laser power, the laser frequency, the microwave power, the cell temperature, the static magnetic field, but also the temperature of some key components, or the translation and rotation of critical wave plates and optical elements, is investigated. The stability budget of the clock frequency at one day is reported and discussed. This study constitutes a solid database for the future demonstration of a CPT-based cell clock with enhanced mid- and long-term stability performances.We report on measurements of frequency shifts in a microwave cesium vapor cell atomic clock based on coherent population trapping (CPT). The dependence of the clock frequency on numerous experimental parameters, such as the laser power, the laser frequency, the microwave power, the cell temperature, the static magnetic field, but also the temperature of some key components, or the translation and rotation of critical wave plates and optical elements, is investigated. The stability budget of the clock frequency at one day is reported and discussed. This study constitutes a solid database for the future demonstration of a CPT-based cell clock with enhanced mid- and long-term stability performances.

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency ControlMay 29, 20254 citations

Characterizing passive coherent population trapping resonance in a cesium vapor cell filled with neon buffer gas

Zhi Liu, Jieying Wang, Wen-Ting Diao +2 more

We present a pair of phase-locked lasers with a 9.2-GHz frequency difference through the injection locking of a master laser to the RF-modulation sideband of a slave diode laser. Using this laser system, a coherent population trapping (CPT) signal with a typical linewidth of ∼ 182 Hz is obtained in a cesium vapor cell filled with 30 Torr (4 kPa) of neon as the buffer gas. We investigate the influence of the partial pressure of the neon buffer gas on the CPT linewidth, amplitude, and frequency shift. The results may offer some references for CPT atomic clocks and CPT atomic magnetometers.We present a pair of phase-locked lasers with a 9.2-GHz frequency difference through the injection locking of a master laser to the RF-modulation sideband of a slave diode laser. Using this laser system, a coherent population trapping (CPT) signal with a typical linewidth of ∼ 182 Hz is obtained in a cesium vapor cell filled with 30 Torr (4 kPa) of neon as the buffer gas. We investigate the influence of the partial pressure of the neon buffer gas on the CPT linewidth, amplitude, and frequency shift. The results may offer some references for CPT atomic clocks and CPT atomic magnetometers.

Chinese Physics BApr 1, 20133 citations

Tunable dual-frequency laser source for coherent population trapping cesium atomic clocks

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Tunable dual-frequency laser source for coherent population trapping cesium atomic clocks

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