Optimization of temperature characteristics of a transportable <sup>87</sup>Rb atomic fountain clock

Xinwen Wang; Kangkang Liu; Henan Cheng; Wei Ren; Jingfeng Xiang; Jingwei Ji; Xiangkai Peng; Zhen Zhang; Jianbo Zhao; Meifeng Ye; Lin Li; Tang Li; Bin Wang; Qiuzhi Qu; Liang Liu; Desheng Lü

doi:doi:10.3788/COL201917.080201

Chinese Optics Letters, 2019, 17 (8): 080201, Published Online: Jul. 19, 2019

Optimization of temperature characteristics of a transportable ⁸⁷Rb atomic fountain clock Download： 990次

Xinwen Wang ^1,2Kangkang Liu ¹Henan Cheng ¹Wei Ren ¹Jingfeng Xiang ¹Jingwei Ji ¹Xiangkai Peng ^1,2Zhen Zhang ¹Jianbo Zhao ¹Meifeng Ye ¹Lin Li ¹Tang Li ¹Bin Wang ¹Qiuzhi Qu ¹Liang Liu ^1,*Desheng Lü ^1,2,**

Author Affiliations

¹ Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

² College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China

Figures & Tables

Fig. 1. Cutaway and picture of the transportable fountain clock assembly. The size and weight of the clock are about $96 cm \times 76 cm \times 180 cm$ and 350 kg, respectively.

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Fig. 2. Model diagrams of the optical benches. (a) The laser source bench with ECDL and TA, which is used to produce and amplify the cooling laser and the repumping laser. ①, ②: ECDLs; ③, ④: the saturation absorption modules; ⑤: TA; ⑥: the repumping laser output; ⑦: cooling laser output. (b) The laser-regulating bench divides and combines the cooling laser or repumping laser. ①: cooling laser input; ②: repumping laser input; ③: upward cooling laser output; ④: downward cooling laser output; ⑤: detection laser output; ⑥ repumping laser output.

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Fig. 3. Ramsey pattern obtained by scanning the microwave frequency of the Ramsey cavity using 0.1 Hz steps. The inset curve is the transition probability versus detuning of the microwave signal by several Hz; the linewidth of the central fringe is approximately 1.02 Hz.

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Fig. 4. Short- and medium-term stabilities of the fountain clock with MOT on. The square dots are the Allan deviations obtained with the clock operating in our laboratory where the temperature fluctuation is about $\pm 1.5 ° C$ . The triangle dots are the Allan deviations obtained with temperature control of the optical bench. The solid line is a fitted curve corresponding to a white frequency noise of $2.3 \times 10^{- 13} τ^{- 1 / 2}$ .

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Fig. 5. Fluctuation in the number of atoms, laser power, and temperature of the optical bench before temperature controlling of the optical bench.

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Fig. 6. Fluctuation in the number of atoms, temperature of the microwave source, and the optical benches when the fountain clock was operated in the thermostat.

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Fig. 7. Allan deviation of the fountain clock frequency with MOT off when it was put into the thermostat. The solid line is the fitting curve of short-term stability. After the averaging time exceeds 100,000 s, the long-term stability reaches the order of $10^{- 16}$ and continues going down.

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Xinwen Wang, Kangkang Liu, Henan Cheng, Wei Ren, Jingfeng Xiang, Jingwei Ji, Xiangkai Peng, Zhen Zhang, Jianbo Zhao, Meifeng Ye, Lin Li, Tang Li, Bin Wang, Qiuzhi Qu, Liang Liu, Desheng Lü. Optimization of temperature characteristics of a transportable ⁸⁷Rb atomic fountain clock[J]. Chinese Optics Letters, 2019, 17(8): 080201.

Optimization of temperature characteristics of a transportable ⁸⁷Rb atomic fountain clock Download： 990次

Fig. 1. Cutaway and picture of the transportable fountain clock assembly. The size and weight of the clock are about $96 cm \times 76 cm \times 180 cm$ and 350 kg, respectively.

Fig. 3. Ramsey pattern obtained by scanning the microwave frequency of the Ramsey cavity using 0.1 Hz steps. The inset curve is the transition probability versus detuning of the microwave signal by several Hz; the linewidth of the central fringe is approximately 1.02 Hz.

Fig. 5. Fluctuation in the number of atoms, laser power, and temperature of the optical bench before temperature controlling of the optical bench.

Fig. 6. Fluctuation in the number of atoms, temperature of the microwave source, and the optical benches when the fountain clock was operated in the thermostat.

Fig. 7. Allan deviation of the fountain clock frequency with MOT off when it was put into the thermostat. The solid line is the fitting curve of short-term stability. After the averaging time exceeds 100,000 s, the long-term stability reaches the order of $10^{- 16}$ and continues going down.

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Optimization of temperature characteristics of a transportable 87Rb atomic fountain clock Download： 990次

Fig. 1. Cutaway and picture of the transportable fountain clock assembly. The size and weight of the clock are about 96 cm×76 cm×180 cm and 350 kg, respectively.

Fig. 3. Ramsey pattern obtained by scanning the microwave frequency of the Ramsey cavity using 0.1 Hz steps. The inset curve is the transition probability versus detuning of the microwave signal by several Hz; the linewidth of the central fringe is approximately 1.02 Hz.

Fig. 5. Fluctuation in the number of atoms, laser power, and temperature of the optical bench before temperature controlling of the optical bench.

Fig. 6. Fluctuation in the number of atoms, temperature of the microwave source, and the optical benches when the fountain clock was operated in the thermostat.

Fig. 7. Allan deviation of the fountain clock frequency with MOT off when it was put into the thermostat. The solid line is the fitting curve of short-term stability. After the averaging time exceeds 100,000 s, the long-term stability reaches the order of 10−16 and continues going down.

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Optimization of temperature characteristics of a transportable ⁸⁷Rb atomic fountain clock Download： 990次

Fig. 1. Cutaway and picture of the transportable fountain clock assembly. The size and weight of the clock are about $96 cm \times 76 cm \times 180 cm$ and 350 kg, respectively.

Fig. 7. Allan deviation of the fountain clock frequency with MOT off when it was put into the thermostat. The solid line is the fitting curve of short-term stability. After the averaging time exceeds 100,000 s, the long-term stability reaches the order of $10^{- 16}$ and continues going down.