Effect of buffer gas ratios on the relationship between cell temperature and frequency shifts of the coherent population trapping resonance

Deng, Ke; Guo, Tao; He, Dingwu; Liu, X. Y.; Liu, L.; Guo, Dengzhu; Chen, X. Z.; Wang, Z.

doi:10.1063/1.2937407

Cited by 32 publications

(17 citation statements)

References 6 publications

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“…The setup is the same as described in Ref. 9. The VCSEL drive current is 1.2mA, with which the laser frequency is on the absorption spectrum of 85 Rb D1 line.…”

Section: Methodsmentioning

confidence: 99%

Light shift in modulated coherent population trapping atomic clocks

Deng

Guo

et al. 2009

2009 IEEE International Frequency Control Symposium Joint With the 22nd European Frequency and Time Forum

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We have studied the light shift in coherent population trapping (CPT) atomic clocks under full band modulation (FBM) and under half band modulation (HBM). The theoretical results show that the light shift under FBM is only 1/4 of the light shift under HBM. Our experimental results confirm the theoretical results. Therefore, we can easily improve the stability of CPT clocks by replacing HBM with FBM.

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“…The setup is the same as described in Ref. 9. The VCSEL drive current is 1.2mA, with which the laser frequency is on the absorption spectrum of 85 Rb D1 line.…”

Section: Methodsmentioning

confidence: 99%

Light shift in modulated coherent population trapping atomic clocks

Deng

Guo

et al. 2009

2009 IEEE International Frequency Control Symposium Joint With the 22nd European Frequency and Time Forum

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“…The miniaturization requirements also lead to the frequent use of vapor cells with relatively high buffer gas pressures. Occasionally, a mixture of gasses is used to reduce the temperature variation of the collisional shifts and improve clock stability [110]. Also, a dynamic Raman-Ramsey interrogation scheme has been successfully implemented to suppress the power broadening of EIT/CPT resonances [34,111,112].…”

Section: Eit-based Metrology Toolsmentioning

confidence: 99%

A practical guide to electromagnetically induced transparency in atomic vapor

et al. 2023

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This tutorial introduces the theoretical and experimental basics of Electromagnetically Induced Transparency (EIT) in thermal alkali vapors. We first give a brief phenomenological description of EIT in simple three-level systems of stationary atoms and derive analytical expressions for optical absorption and dispersion under EIT conditions. Then we focus on how the thermal motion of atoms affects various parameters of the EIT system. Specifically, we analyze the Doppler broadening of optical transitions, ballistic versus diffusive atomic motion in a limited-volume interaction region, and collisional depopulation and decoherence. Finally, we discuss the common trade-offs important for optimizing an EIT experiment and give a brief "walk-through" of a typical EIT experimental setup. We conclude with a brief overview of current and potential EIT applications.

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“…In order to realize the two loops, we use one MCU to generate modulation signals to bring out error signals. [10,11] In the absorption loop, we use a DC current signal with small square perturbation to pump the VCSEL. In the CPT loop, we apply a triangle wave current perturbation signal to the input port of charge pump to generate the frequency modulation effect, as a result, the spectrum of 3.035GHz signal splits with a distance of the modulation frequency.…”

Section: Scheme Of Frequency Modulation Using Cpt Resonatormentioning

confidence: 99%

Low power chip-scale CPT atomic clock with new microwave frequency modulation technique

Cheng

Zhang

et al. 2014

2014 IEEE International Frequency Control Symposium (FCS)

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we present a new chip-scale atomic clock with low power consumption based on a new microwave frequency modulation technique achieved with the voltage-control oscillator (VCO) and the new servo circuit designed for frequency-locking the microwave to an 85 Rb coherent population trap (CPT) atomic resonator. The microwave modulation is achieved by directly injecting triangular current signal into the charge-pump of the phase-locked loop. The system volume is less than 50 cm 3 and the total power consumption of the whole system is less than 600mW. Experiments on frequency stability are performed under laboratory environment, and the results show that the frequency stability (overlapping Allan deviation) of the 10 MHz output signal reaches 2×10 -10 at average time of 1 s, and 5×10 -11 at average time of 1000 s. These results reveal that our atomic clock is practical for most applications that require compact, high stable and low-power consumption frequency sources.

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Effect of buffer gas ratios on the relationship between cell temperature and frequency shifts of the coherent population trapping resonance

Cited by 32 publications

References 6 publications

Light shift in modulated coherent population trapping atomic clocks

Light shift in modulated coherent population trapping atomic clocks

A practical guide to electromagnetically induced transparency in atomic vapor

Low power chip-scale CPT atomic clock with new microwave frequency modulation technique

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