基于GPS共视法远程校准原理,在上海市计量测试技术研究院与华东师范大学之间搭建了GPS共视比对远程校准系统。利用该系统为华东师范大学精密光谱科学与技术国家重点实验室(科技部)的铷原子频率标准装置提供远程校准服务。基于30 d CGGTT...基于GPS共视法远程校准原理,在上海市计量测试技术研究院与华东师范大学之间搭建了GPS共视比对远程校准系统。利用该系统为华东师范大学精密光谱科学与技术国家重点实验室(科技部)的铷原子频率标准装置提供远程校准服务。基于30 d CGGTTS标准格式文件的实验数据和所编制的数据分析软件,分别计算出铷原子频率标准的相对频率偏差、相对频率准确度、频率日漂移率和日稳定度。实验结果表明,这些参数满足技术规范提出的技术指标要求。该GPS共视比对远程校准系统具备正确性、稳定性和可靠性的优点,能够为铷原子频率标准装置提供可行的远程量值溯源服务。展开更多
Two Nd:YAG lasers operating at 1064 nm are separately servo-locked to two vertically mounted ultra-stable cavities. The optical heterodyne beat between two cavity-stabilized lasers shows that the linewidth of each las...Two Nd:YAG lasers operating at 1064 nm are separately servo-locked to two vertically mounted ultra-stable cavities. The optical heterodyne beat between two cavity-stabilized lasers shows that the linewidth of each laser reaches 2 Hz and the average frequency drift reduces to less than 1 Hz/s.展开更多
The modulation transfer spectroscopy in an ytterbium hollow cathode lamp at 399 nm is measured.The error signal for frequency locking is optimized by measuring the dependences of its slope,linewidth and magnitude on v...The modulation transfer spectroscopy in an ytterbium hollow cathode lamp at 399 nm is measured.The error signal for frequency locking is optimized by measuring the dependences of its slope,linewidth and magnitude on various parameters.Under the optimum condition,the laser frequency at 399 nm can be stabilized.The long-term stability of laser frequency is measured by monitoring the fluorescence signal of the ytterbium atomic beam induced by the locked laser.The laser frequency is shown to be tightly locked,and the stabilized laser is successfully applied to the cooling of ytterbium atoms.展开更多
An optical atomic clock with 171Yb atoms is devised and tested. By using a two-stage Doppler cooling technique, the 171Yb atoms are cooled down to a temperature of 6 ± 3 μK, which is close to the Doppler limit. ...An optical atomic clock with 171Yb atoms is devised and tested. By using a two-stage Doppler cooling technique, the 171Yb atoms are cooled down to a temperature of 6 ± 3 μK, which is close to the Doppler limit. Then, the cold 171Yb atoms are loaded into a one-dimensional optical lattice with a wavelength of 759 nm in the Lamb-Dicke regime. Furthermore, these cold 171Yb atoms are excited from the ground-state 1S0 to the excited-state 3P0 by a clock laser with a wavelength of 578 nm. Finally, the 1S0-3P0 clock-transition spectrum of these 171Yb atoms is obtained by measuring the dependence of the population of the ground-state 1S0 upon the clock-laser detuning.展开更多
We develop a permanent-magnet Zeeman slower with adjustable magnets along the longitudinal and radial directions.Produced by four arrays of cylindrical magnets, the longitudinal magnetic field in the slower is tunable...We develop a permanent-magnet Zeeman slower with adjustable magnets along the longitudinal and radial directions.Produced by four arrays of cylindrical magnets, the longitudinal magnetic field in the slower is tunable if relevant parameters vary, for example, laser detuning or intensity. The proposed Zeeman slower can be reconfigured for Sr atoms. Additionally,we demonstrate that the residual magnetic field produced by the permanent magnets in the magneto-optical trap region can be as small as 0.5 Gs.展开更多
We theoretically investigate several parameters for the nuclear magnetic resonance gyroscope based on ^(133)C_(s–)^(129)Xe/^(131)Xe. For a cell containing a mixture of ^(133)Cs at saturated pressure, we investigate t...We theoretically investigate several parameters for the nuclear magnetic resonance gyroscope based on ^(133)C_(s–)^(129)Xe/^(131)Xe. For a cell containing a mixture of ^(133)Cs at saturated pressure, we investigate the optimal quenching gas(N_2) pressure and the corresponding pump laser intensity to achieve 30% ^(133)Cs polarization at the center of the cell when the static magnetic field B0 is 5 μT with different ^(129)Xe/^(131)Xe pressure. The effective field produced by spin-exchange polarized ^(129)Xe or ^(131)Xe sensed by ^(133)Cs can also be discussed in different^(129)Xe/^(131)Xe pressure conditions. Furthermore,the relationship between the detected signal and the probe laser frequency is researched. We obtain the optimum probe laser detuning from the D2(6~2S_(1/2)→ 6~2P_(3/2)) resonance with different ^(129)Xe/^(131)Xe pressure owing to the pressure broadening.展开更多
The optical atomic clocks have the potential to transform global timekeeping,relying on the state-of-the-art accuracy and stability,and greatly improve the measurement precision for a wide range of scientific and tech...The optical atomic clocks have the potential to transform global timekeeping,relying on the state-of-the-art accuracy and stability,and greatly improve the measurement precision for a wide range of scientific and technological applications.Herein we report on the development of the optical clock based on 171Yb atoms confined in an optical lattice.A minimum width of 1.92-Hz Rabi spectra has been obtained with a new 578-nm clock interrogation laser.The in-loop fractional instability of the 171Yb clock reaches 9.1×10-18 after an averaging over a time of 2.0×104 s.By synchronous comparison between two clocks,we demonstrate that our 171Yb optical lattice clock achieves a fractional instability of 4.60×10-16/√τ.展开更多
文摘基于GPS共视法远程校准原理,在上海市计量测试技术研究院与华东师范大学之间搭建了GPS共视比对远程校准系统。利用该系统为华东师范大学精密光谱科学与技术国家重点实验室(科技部)的铷原子频率标准装置提供远程校准服务。基于30 d CGGTTS标准格式文件的实验数据和所编制的数据分析软件,分别计算出铷原子频率标准的相对频率偏差、相对频率准确度、频率日漂移率和日稳定度。实验结果表明,这些参数满足技术规范提出的技术指标要求。该GPS共视比对远程校准系统具备正确性、稳定性和可靠性的优点,能够为铷原子频率标准装置提供可行的远程量值溯源服务。
基金Project supported by the National Natural Science Foundation of China (Grant No 60490280)the State Key Development for Basic Research Program of China (Grant Nos 2006CB806005 and 2006CB921104)+2 种基金the Science and Technology Commission of Shanghai Municipality, China (Grant Nos 06JC14026 and 07JC14019)Shanghai Pujiang Talent Program, China (Grant No 07PJ14038)the Program for Changjiang Scholars and Innovative Research Teams, China
文摘Two Nd:YAG lasers operating at 1064 nm are separately servo-locked to two vertically mounted ultra-stable cavities. The optical heterodyne beat between two cavity-stabilized lasers shows that the linewidth of each laser reaches 2 Hz and the average frequency drift reduces to less than 1 Hz/s.
基金Project supported by the National Natural Science Foundation of China(Grant No.10774044)the National Key Basic Research and Development Program of China(Grant No.2010CB922903)+1 种基金the Science and Technology Commission of Shanghai Municipality of China(Grant No.07JC14019)Shanghai Pujiang Talent Program of China(Grant No.07PJ14038)
文摘The modulation transfer spectroscopy in an ytterbium hollow cathode lamp at 399 nm is measured.The error signal for frequency locking is optimized by measuring the dependences of its slope,linewidth and magnitude on various parameters.Under the optimum condition,the laser frequency at 399 nm can be stabilized.The long-term stability of laser frequency is measured by monitoring the fluorescence signal of the ytterbium atomic beam induced by the locked laser.The laser frequency is shown to be tightly locked,and the stabilized laser is successfully applied to the cooling of ytterbium atoms.
基金supported by the National Basic Research Program of China (Grant Nos. 2012CB821302 and 2010CB922903)the National Natural Science Foundation of China (Grant Nos. 11134003 and 10774044)the Shanghai Excellent Academic Leaders Program of China (Grant No. 12XD1402400)
文摘An optical atomic clock with 171Yb atoms is devised and tested. By using a two-stage Doppler cooling technique, the 171Yb atoms are cooled down to a temperature of 6 ± 3 μK, which is close to the Doppler limit. Then, the cold 171Yb atoms are loaded into a one-dimensional optical lattice with a wavelength of 759 nm in the Lamb-Dicke regime. Furthermore, these cold 171Yb atoms are excited from the ground-state 1S0 to the excited-state 3P0 by a clock laser with a wavelength of 578 nm. Finally, the 1S0-3P0 clock-transition spectrum of these 171Yb atoms is obtained by measuring the dependence of the population of the ground-state 1S0 upon the clock-laser detuning.
基金Project supported by the National Key Basic Research and Development Program of China(Grant Nos.2012CB821302 and 2016YFA0302103)the National Natural Science Foundation of China(Grant No.11134003)+1 种基金the National High Technology Research and Development Program of China(Grant No.2014AA123401)the Shanghai Excellent Academic Leaders Program of China(Grant No.12XD1402400)
文摘We develop a permanent-magnet Zeeman slower with adjustable magnets along the longitudinal and radial directions.Produced by four arrays of cylindrical magnets, the longitudinal magnetic field in the slower is tunable if relevant parameters vary, for example, laser detuning or intensity. The proposed Zeeman slower can be reconfigured for Sr atoms. Additionally,we demonstrate that the residual magnetic field produced by the permanent magnets in the magneto-optical trap region can be as small as 0.5 Gs.
基金Project supported by the National High Technology Research and Development Program of China(Grant No.2014AA123401)the National Key BasResearch and Development Program of China(Grant Nos.2016YFA0302103 and 2012CB821302)+1 种基金the National Natural Science Foundation of China(Gra11134003)Shanghai Excellent Academic Leaders Program of China(Grant No.12XD1402400)
文摘We theoretically investigate several parameters for the nuclear magnetic resonance gyroscope based on ^(133)C_(s–)^(129)Xe/^(131)Xe. For a cell containing a mixture of ^(133)Cs at saturated pressure, we investigate the optimal quenching gas(N_2) pressure and the corresponding pump laser intensity to achieve 30% ^(133)Cs polarization at the center of the cell when the static magnetic field B0 is 5 μT with different ^(129)Xe/^(131)Xe pressure. The effective field produced by spin-exchange polarized ^(129)Xe or ^(131)Xe sensed by ^(133)Cs can also be discussed in different^(129)Xe/^(131)Xe pressure conditions. Furthermore,the relationship between the detected signal and the probe laser frequency is researched. We obtain the optimum probe laser detuning from the D2(6~2S_(1/2)→ 6~2P_(3/2)) resonance with different ^(129)Xe/^(131)Xe pressure owing to the pressure broadening.
基金Project supported by the National Key Basic Research and Development Program of China(Grant Nos.2016YFA0302103,2017YFF0212003,and 2016YFB0501601)the Municipal Science and Technology Major Project of Shanghai,China(Grant No.2019SHDZX01)+1 种基金the National Natural Science Foundation of China(Grant No.11134003)the Excellent Academic Leaders Program of Shanghai,China(Grant No.12XD1402400).
文摘The optical atomic clocks have the potential to transform global timekeeping,relying on the state-of-the-art accuracy and stability,and greatly improve the measurement precision for a wide range of scientific and technological applications.Herein we report on the development of the optical clock based on 171Yb atoms confined in an optical lattice.A minimum width of 1.92-Hz Rabi spectra has been obtained with a new 578-nm clock interrogation laser.The in-loop fractional instability of the 171Yb clock reaches 9.1×10-18 after an averaging over a time of 2.0×104 s.By synchronous comparison between two clocks,we demonstrate that our 171Yb optical lattice clock achieves a fractional instability of 4.60×10-16/√τ.
