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In this paper, we propose a new method to reduce the temperature sensitivity of Chip Scale Atomic Clocks. We studied the relationship between RF power and the light shift as well as the relationship between the temperature and the collision shift, and the results are given. It is shown that the frequency shift caused by the change of the temperature can be compensated by the variation of light shift...
We have theoretically and experimentally proven that the transient transmitted laser power through a typical Λ system atomic cell near Coherent Population Trapping resonance presents as a damping oscillation. The oscillating frequency is identical to the frequency detuning from the atomic hyperfine splitting. Based on the transient coherent population trapping (TCPT) phenomenon, we have proposed an...
This paper introduce three main technologies in our coherent population trapping clock. The rubidium vapor cell is fabricated by glass-silicon anodic bonding techniques. We use two different buffer gases (Ar and Ne) that produce opposite shift rates to reduce the dependence of the clock frequency stability on the temperature stability of the atoms. We use the ceramic-filled coaxial resonator as the...
We describe the fabrication of Rubidium (Rb) vapor cells using glass-silicon anodic bonding techniques and chemical reaction between rubidium chloride and barium azide. The pure metallic Rb drops and buffer gases were obtained in the cells with few mm3 internal volumes. The optical absorption resonance of 85Rb D1 transition with proper broadening and the corresponding coherent population trapping...
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.
We have studied the effects of the intensity difference of the two laser fields on the performance of the coherent population trapping (CPT) atomic clocks. Our experimental results show that there is a ratio range for the intensity of the two laser fields, between 1:2 and 2:1, in which the CPT resonance has larger amplitude and narrower line width. If we can adjust the ratio close to the center (1:...
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