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

Fabiola A. Camargo, Patrick Georges, Gaëlle Lucas-Leclin +8 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

Laser Frequency Offset Locking with Dual-modulation

Wang Bisong, Peter Yun, Qiang Hao

We report a laser frequency offset locking scheme for coherent population trapping (CPT) atomic clock. Based on a usual half-wave modulation in CPT atomic clocks, we add a radio frequency signal to the laser driving current to form dual-modulation to compensate the frequency shift of optical transition due to buffer gas in the clock cell. The Doppler-free absorption enhanced spectrum produced by dual-modulation is observed and successfully applied to the laser frequency offset locking. In our scheme, a frequency shift device is no longer necessary, thus the clock's size, weight, power, complexity, environmental sensitivity, and cost are reduced, this is suitable for implementing compact and high-performance CPT and POP atomic clocks.We report a laser frequency offset locking scheme for coherent population trapping (CPT) atomic clock. Based on a usual half-wave modulation in CPT atomic clocks, we add a radio frequency signal to the laser driving current to form dual-modulation to compensate the frequency shift of optical transition due to buffer gas in the clock cell. The Doppler-free absorption enhanced spectrum produced by dual-modulation is observed and successfully applied to the laser frequency offset locking. In our scheme, a frequency shift device is no longer necessary, thus the clock's size, weight, power, complexity, environmental sensitivity, and cost are reduced, this is suitable for implementing compact and high-performance CPT and POP atomic clocks.

European Frequency and Time ForumJun 25, 20240 citations

A 780 nm Dual-Frequency Faraday Laser

Xiaomin Qin, Zijie Liu, Tiantian Shi +1 more

We demonstrate a dual-frequency (DF) Faraday laser operating on 780 nm using an87Rb Faraday anomalous dispersion optical filter (FADOF) as the frequency selection element. The frequencies of the two modes correspond to the transition of87Rb 52S1/2(F=1) to 52P3/2and 52S1/2(F=2) to 52P3/2, respectively. The output laser wavelength has good robustness to the laser diode’s current and temperature fluctuations. The frequency difference between the two modes is tunable with the temperature of87Rb vapor cell and cavity length. Besides, the two modes share good coherence with the most probable linewidth of the beat-note spectra being 3 kHz. Such a 780 nm DF Faraday laser can be used in precision measurement, such as, laser frequency stabilization, optical microwave generation, and coherent population trapping (CPT) atomic clocks.We demonstrate a dual-frequency (DF) Faraday laser operating on 780 nm using an87Rb Faraday anomalous dispersion optical filter (FADOF) as the frequency selection element. The frequencies of the two modes correspond to the transition of87Rb 52S1/2(F=1) to 52P3/2and 52S1/2(F=2) to 52P3/2, respectively. The output laser wavelength has good robustness to the laser diode’s current and temperature fluctuations. The frequency difference between the two modes is tunable with the temperature of87Rb vapor cell and cavity length. Besides, the two modes share good coherence with the most probable linewidth of the beat-note spectra being 3 kHz. Such a 780 nm DF Faraday laser can be used in precision measurement, such as, laser frequency stabilization, optical microwave generation, and coherent population trapping (CPT) atomic clocks.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)May 15, 20230 citations

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

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