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Raman-Ramsey CPT with a grating magneto-optical trap 带光栅磁光阱的Raman-Ramsey CPT
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-07-12 DOI: 10.1109/EFTF.2018.8408998
Rachel Elvin, G. Hoth, Michael W. Wright, J. McGilligan, A. Arnold, P. Griffin, E. Riis
{"title":"Raman-Ramsey CPT with a grating magneto-optical trap","authors":"Rachel Elvin, G. Hoth, Michael W. Wright, J. McGilligan, A. Arnold, P. Griffin, E. Riis","doi":"10.1109/EFTF.2018.8408998","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8408998","url":null,"abstract":"We describe an experiment which combines cold 87 Rb atoms from a grating magneto-optical trap (GMOT) with Lin±Lin coherent population trapping (CPT) and pulsed Ramsey interrogation. The bichromatic fields required for Lin±Lin are generated by combining light from a single external cavity diode laser (ECDL) with an electro-optic modulator (EOM) and an acousto-optic modulator (AOM). With this laser system and the GMOT, we are able to produce Raman-Ramsey fringes using either the F' = 1 or the F' = 2 excited states of the 87Rb Di line. As a step towards realising a frequency standard based on the GMOT, we measure the Ramsey fringe amplitude as a function of the magnetic bias field and the excited state. We observe dark state interference with F' = 1 and show that this interference is suppressed with F' = 2, as expected from prior work on CPT with 87Rb in thermal vapour cells.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132469250","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: 6
Hysteresis in phononic frequency combs 声子频率梳的迟滞现象
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-07-09 DOI: 10.1109/EFTF.2018.8408985
A. Ganesan, A. Seshia
{"title":"Hysteresis in phononic frequency combs","authors":"A. Ganesan, A. Seshia","doi":"10.1109/EFTF.2018.8408985","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8408985","url":null,"abstract":"This paper reports the experimental observations for hysteresis in phononic frequency combs. The systematic control of drive conditions in different paths presents evidence for non-unique frequency comb solutions for specific drive conditions. These results can thus present an opportunity to tailor frequency comb spectra with desired frequencies and stabilities, utilizing the hysteretic operation.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123985957","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: 1
Galileo and GNSS time offsets 伽利略和GNSS时间偏移
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-11 DOI: 10.1109/EFTF.2018.8409048
G. Signorile, I. Sesia, T. T. Thai, P. Defraigne, P. Tavella
{"title":"Galileo and GNSS time offsets","authors":"G. Signorile, I. Sesia, T. T. Thai, P. Defraigne, P. Tavella","doi":"10.1109/EFTF.2018.8409048","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409048","url":null,"abstract":"Galileo disseminates the GPS to Galileo Time Offset (GGTO) through the navigation message. This broadcast offset allows the user of a combined GSP/Galileo receiver to achieve a unique navigation solution by using measurements from both GPS and Galileo satellites. Nowadays, many positioning systems are available, the topic of interoperability is therefore crucial. The time offsets between the different systems should therefore be made available to the multi-GNSS users. An alternative would be that each constellation broadcasts only the time offset between its time scale and a reference common to all GNSS. In this paper we propose two alternative for, for this reference: either it can be based on the combination of the different GNSS time scales, or it can be directly UTC, as predicted and broadcast by the different systems. This paper presents a first assessment of the performances that can be achieved with each of these two approaches.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116817211","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: 3
Multi-GNSS time transfer with CGGTTS-V2E 使用cggttts - v2e进行多gnss时间传输
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-11 DOI: 10.1109/EFTF.2018.8409047
P. Defraigne, Katrijn Verhasselt
{"title":"Multi-GNSS time transfer with CGGTTS-V2E","authors":"P. Defraigne, Katrijn Verhasselt","doi":"10.1109/EFTF.2018.8409047","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409047","url":null,"abstract":"A software tool was developed at the Royal Observatory of Belgium for building the CGGTTS products from the RINEX observation and navigation files provided by the GNSS receivers. This software has been completely re-built in order to increase the robustness, the computation speed, and to include GPS, GLONASS, BeiDou and Galileo. The first part of the paper describes this new software tool. Then some time transfer experiments are realized for a short and a long baseline, comparing the results obtained from single-constellation with the multi-constellation solutions. We show that even with an incomplete constellation, Galileo already provides time transfer results with nearly the same quality as GPS for the short baseline, and 1.5 times better for the long baseline time link. Combining GPS and Galileo satellites furthermore improves the time transfer link with respect to the GPS-only or Galileo-only solutions, reducing the noise by a factor of about 1.4. Adding moreover BeiDou satellites in the combination gives a solution similar to the solution obtained from GPS+Galileo.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130395163","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: 13
Finding the upper mass limit until which gravimetric sensors preserve their original TCF and sensitivity 寻找重力传感器保持其原始TCF和灵敏度的质量上限
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-10 DOI: 10.1109/EFTF.2018.8408988
T. Mirea, M. Clement, J. Olivares, E. Iborra
{"title":"Finding the upper mass limit until which gravimetric sensors preserve their original TCF and sensitivity","authors":"T. Mirea, M. Clement, J. Olivares, E. Iborra","doi":"10.1109/EFTF.2018.8408988","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8408988","url":null,"abstract":"Thin film bulk acoustic wave resonators (FBARs) have undoubtedly overcome the mass sensitivity of their predecessors quartz crystal microbalances. However, the mass sensitivity of FBARs strongly depends on all layers composing their complex structure. It has been proved that the addition of materials with different acoustic impedances at the sensing surface of the device can vary their sensitivity by energy redistribution effects. Such materials have been also used for temperature coefficient (TCF) compensation. Here we aim at studying up to which thickness of an added specific material on AlN-based solidly mounted resonators (SMRs), the initial mass sensitivity and TCF are still preserved. We prove that the sensitivity can be considered lineal up to the deposition of around 100 nm of SiO2, not affecting the detection of small masses in the pg range. On the contrary, TCF variation with few nm of SiO2 needs to be accurately controlled since it affects the detection in the pg range. For the detection of heavy masses, these effects can be considered negligible. This study should be performed for each particular case depending on the material accumulated on the device.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123784992","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
Thermal noise further reduced ultrastable laser with frequency instability of 5൷10−16 热噪声进一步降低了激光的超稳性，频率不稳定性为5൷10−16
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-10 DOI: 10.1109/EFTF.2018.8409063
Lulu Yan, Zhaoyang Tai, Yanyan Zhang, Pan Zhang, Wenyu Zhao, Xiaofei Zhang, Wenge Guo, Shougang Zhang, Haifeng Jiang
{"title":"Thermal noise further reduced ultrastable laser with frequency instability of 5൷10−16","authors":"Lulu Yan, Zhaoyang Tai, Yanyan Zhang, Pan Zhang, Wenyu Zhao, Xiaofei Zhang, Wenge Guo, Shougang Zhang, Haifeng Jiang","doi":"10.1109/EFTF.2018.8409063","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409063","url":null,"abstract":"We report on the progress of the thermal noise further reduced method via enlarging the equivalent beam size without increasing the cavity length in cavity-stabilized lasers at 1555 nm, which are built as the frequency source for a photonic microwave generation system. In addition, we perform an experiment to evaluate the effect of thermal noise reduced method via estimating the frequency instability of a synthesized new ultrastable laser. The relative frequency instability reaches 5∗10−16 at 1 s averaging time via reducing the thermal noise of the cavity.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129211814","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
CPT atomic clock based on an antirelaxation-coated cell and quadrature-signal method of the light shift cancellation CPT原子钟基于抗松弛包覆单元和光移抵消的正交信号方法
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-10 DOI: 10.1109/EFTF.2018.8409003
S. Ignatovich, V. Vishnyakov, A. Makarov, M. Skvortsov, N. L. Kvashnin, V. A. Vasiliev, S. Atutov, D. Brazhnikov, V. Yudin, A. Taichenachev, S. Bagayev
{"title":"CPT atomic clock based on an antirelaxation-coated cell and quadrature-signal method of the light shift cancellation","authors":"S. Ignatovich, V. Vishnyakov, A. Makarov, M. Skvortsov, N. L. Kvashnin, V. A. Vasiliev, S. Atutov, D. Brazhnikov, V. Yudin, A. Taichenachev, S. Bagayev","doi":"10.1109/EFTF.2018.8409003","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409003","url":null,"abstract":"High-stability and compact clocks are in great demand for many applications, for example, such as global navigation satellite systems (GNSS), broadband communication networks and high-secret lines, smart electricity grids, etc. Many applications of the clocks require small size and weight (V < 50 cm3, m < 50 g), low power consumption (P << 1 W) and high long-term frequency stability (< 5×10−12 per a day). The most promising technology involves approach based on the coherent populations trapping (CPT) phenomenon, because it can combine all the features listed. Here we present the recent progress of development a version of CPT atomic clocks, which involves an antirelaxation-coated cell and the quadrature-signal method for the light shift cancellation.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123931399","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
Relativistic corrections for intersatellite frequency transfer 卫星间频率传输的相对论修正
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-10 DOI: 10.1109/EFTF.2018.8409041
Bethany Kroese, G. Giorgi, C. Günther
{"title":"Relativistic corrections for intersatellite frequency transfer","authors":"Bethany Kroese, G. Giorgi, C. Günther","doi":"10.1109/EFTF.2018.8409041","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409041","url":null,"abstract":"Highly accurate time and frequency synchronization is crucial for navigation. Constant improvements in clock technology enable more precise systems. This in turn places stricter demands on coordination and dissemination of timescales. This paper is motivated by an interest in evaluating future concepts for GNSS (Global Navigation Satellite System) constellations. Within the field of space-based time and frequency transfer, intersatellite links are of high interest for GNSS clock synchronization. In addition to synchronizing clocks, these links can improve orbit determination through precise ranging. Transmissions resolve time and frequency information (i.e. clock offsets and drifts) by modeling satellite orbit effects and propagation delays. In order to fully capitalize on the stability of next-generation space clocks, relativistic corrections must be described to a high level of precision and satellite positions must be accurately known.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124943571","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
A high Q length-extension mode quartz resonator for MEMS oscillator and time-frequency applications 用于MEMS振荡器和时频应用的高Q长度扩展模式石英谐振器
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-10 DOI: 10.1109/EFTF.2018.8408989
Chapellier Paul, L.-A. Pierre, Dulmet Bernard, Le Traon Olivier
{"title":"A high Q length-extension mode quartz resonator for MEMS oscillator and time-frequency applications","authors":"Chapellier Paul, L.-A. Pierre, Dulmet Bernard, Le Traon Olivier","doi":"10.1109/EFTF.2018.8408989","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8408989","url":null,"abstract":"This paper presents recent advances on two-dimensional Length-Extensional Modes (LEM) quartz micro-resonators providing high quality factor (Q) on resonances at a fewMHz. The resonators have been manufactured with a two teps Deep Reactive Ion Etching (DRIE) in a wafer level process reducing costs for collective realization. Samples vibrating at 2.2 and 3.0 MHz on the fundamental mode have shown promising results with very high Q exceeding 200,000. Best result obtained so far were obtained on a partial mode vibrating at 6.6 MHz reaching a Q of 250,000. The collective process, advantages of quartz and high Q make these resonators a promising candidate for Time & Frequency applications.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125689773","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: 1
Absolute frequency measurement of the ytterbium ion E3 optical clock transition using international atomic time 利用国际原子时测量镱离子E3光钟跃迁的绝对频率
2018 European Frequency and Time Forum (EFTF) Pub Date : 2018-04-10 DOI: 10.1109/EFTF.2018.8409057
R. Godun, C. Baynham, Jonathan M. Jones, S. King, P. Nisbet-Jones, F. Baynes, A. Rolland, P. Baird, K. Bongs, P. Gill, G. Petit, H. Margolis
{"title":"Absolute frequency measurement of the ytterbium ion E3 optical clock transition using international atomic time","authors":"R. Godun, C. Baynham, Jonathan M. Jones, S. King, P. Nisbet-Jones, F. Baynes, A. Rolland, P. Baird, K. Bongs, P. Gill, G. Petit, H. Margolis","doi":"10.1109/EFTF.2018.8409057","DOIUrl":"https://doi.org/10.1109/EFTF.2018.8409057","url":null,"abstract":"We report a revised absolute frequency measurement of the 171Yb+ electric octupole optical clock transition of 642 121 496 772 645.17(22) Hz, with a fractional uncertainty of 3.4 χ 10–16. This newer value, with lower uncertainty, is achieved through additional analysis of previously reported experimental data that links the optical frequency to the SI second through international atomic time (TAI). The new step in the data analysis involves a special computation of the fractional frequency offset between the scale interval of TAI and the SI second, over a time interval more closely matched to the experimental data acquisition period.","PeriodicalId":395582,"journal":{"name":"2018 European Frequency and Time Forum (EFTF)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132929916","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: 4
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