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2018 European Frequency and Time Forum (EFTF)最新文献

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Kinetics of atoms cooled on clock transitions: Behavior of energy and momentum 原子钟跃迁冷却的动力学:能量和动量的行为
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-01 DOI: 10.1109/EFTF.2018.8409070
R. Il’enkov, A. Taichenachev, V. Yudin, O. Prudnikov
{"title":"Kinetics of atoms cooled on clock transitions: Behavior of energy and momentum","authors":"R. Il’enkov, A. Taichenachev, V. Yudin, O. Prudnikov","doi":"10.1109/EFTF.2018.8409070","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409070","url":null,"abstract":"We study laser cooling of atoms with narrow-line optical transition, i.e. in regimes when quantum nature of laser-light interactions results significant effect on atom kinetics. We demonstrate the minimum of laser cooing temperature is reached for the light field detuning close to −3 recoil frequency, i.e. is much differ from standard Doppler cooling theory is used for semiclassical description of laser cooling. We define a set of dimensionless parameters that describe the steady state solution of cold atom distribution in laser light and cooling time. The results can be used for analysis an optimal conditions of laser cooling of atoms with narrow lines Ca, Sr and Mg are of interest for optical time standards.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131346980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of the strontium optical lattice clock at national time service center 国家报时中心锶光学点阵钟的研制
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-01 DOI: 10.1109/EFTF.2018.8409072
Mojuan Yin, Qinfang Xu, Yebing Wang, Jie Ren, Yang Guo, Hong Chang
{"title":"Development of the strontium optical lattice clock at national time service center","authors":"Mojuan Yin, Qinfang Xu, Yebing Wang, Jie Ren, Yang Guo, Hong Chang","doi":"10.1109/EFTF.2018.8409072","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409072","url":null,"abstract":"A closed-loop operation optical lattice clock of <sup>87</sup>Sr has been realized built in National Time Service Center of China. The linewidth of spin-polarized clock transition spectrum is 3.9 Hz with a interrogating time of 300 ms. The instability is measured to be about 5×10<sup>−15</sup>/ τ <sup>1/2</sup> from the fit function of the in-loop error signal data, which affected mainly by the white noise. The fractional frequency difference averages down to 6×10<sup>−17</sup> at an average time of 3000 s.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131404864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DWDM stabilized optics for white rabbit 用于白兔的DWDM稳定光学器件
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-01 DOI: 10.1109/EFTF.2018.8409035
P. Boven
{"title":"DWDM stabilized optics for white rabbit","authors":"P. Boven","doi":"10.1109/EFTF.2018.8409035","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409035","url":null,"abstract":"We describe the design of time distribution for the SKA using WR with DWDM optics. Included are accuracy estimates accounting for temperature, dispersion, calibration, attenuation, wavelength uncertainty and the Sagnac effect, and experimental results on long distance links.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121476366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
The features of collective level shift and line broadening in a fabry-perot microcavity and near the conducting surface 法布里-珀罗微腔及导体表面附近的集体能级漂移和线展宽特征
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-01 DOI: 10.1109/EFTF.2018.8409071
A. S. Kuraptsev, I. Sokolov
{"title":"The features of collective level shift and line broadening in a fabry-perot microcavity and near the conducting surface","authors":"A. S. Kuraptsev, I. Sokolov","doi":"10.1109/EFTF.2018.8409071","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409071","url":null,"abstract":"On the basis of consequent microscopic quantum approach we calculate collective level shifts and line broadening in the polyatomic ensemble located in the Fabry-Perot cavity or near the conducting surface. We show that the cavity or the surface can essentially modify dipole-dipole interaction and consequently spectral properties of studied impurity ensembles. This modification is explained by the peculiarities of the structure of modes of electromagnetic field in these cases.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116925853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A recursive clock anomalies detector with double exponential smoothing 具有双指数平滑的递归时钟异常检测器
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-01 DOI: 10.1109/EFTF.2018.8409042
V. Formichella, P. Tavella
{"title":"A recursive clock anomalies detector with double exponential smoothing","authors":"V. Formichella, P. Tavella","doi":"10.1109/EFTF.2018.8409042","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409042","url":null,"abstract":"Space qualified atomic clocks are fundamental in Global Navigation Satellite Systems, but they can suffer from different types of anomalies, like phase and frequency jumps, frequency drift changes and variance changes. Different solutions have been proposed for an automated on-board detection of clock anomalies, among which a frequency jump detector based on a recursive exponential filter, with soft requirements in terms of memory and computational power and hence particularly useful for on-board applications. Here, we propose a generalization of this recursive detector, based on double exponential smoothing: it properly takes into account the frequency drift and also detects drift and variance changes. Then, we test a first version of our detector on simulated and real data, and we discuss the results.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126997906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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