Joint meeting of the ESA Topical Teams: “ACES & General Relativity” and “ACES & Geodesy, clocks and time transfer”

The next joint meeting of the ESA Topical Teams: ACES & General Relativity and ACES & Geodesy, clocks and time transfer will be held at the Technical University of Munich, Germany, between Oct. 22, 2018 and Oct. 24, 2018. This meeting focuses on the utilization of ACES and highly accurate clocks in space, both from a point of view of space geodesy and fundamental physics. Topics of interest are:
1. The application and potential of highly accurate Clocks in Space such as ACES
2. Tests of the Einstein Equivalence Principle (EEP)
3. Laser Time Transfer using Satellites such as ACES and T2L2
4. Future applications of coherent time in space geodesy
5. The distribution of accurate time and frequency for metrology and geodesy

The colloquium will bring together the scientific community interested in the applications of highly accurate space clocks like ACES/PHARAO in all domains, from theoretical physics to cold atoms and application in geodesy and atmospheric studies. Furthermore we look at the scientific potential of near lossless links among high performing ground clocks and satellite clocks, both in time and frequency.

The meeting will consist of invited and contributed presentations on the details of ACES, data analysis and scientific applications. Whilst centered on ACES/PHARAO the colloquium is open to more general contributions on theory and experiments in any of the related subject areas. The aim is to prepare within the broad scientific community for the upcoming launch (2020), the  scientific exploitation of the data and the development of new applications in space geodesy.

The workshop will include both review and contributed talks with ample time for discussion.

=> Information and registration website.

Enrico Rubiola awarded the 2018 W.G. Cady Award

Enrico Rubiola (FEMTO-ST Institute) has received the 2018 W.G. Cady Award “for ground-breaking contributions to noise analysis and signal-source theory, and experimental achievements in the electronic and photonic domains.”

The W. G. Cady Award is to recognize outstanding contributions related to the fields of piezoelectric or other classical frequency control, selection and measurement; and resonant sensor devices.

=> Announcement.

20th of April 2018 (Paris) – PhD defense of Namneet Kaur

Namneet Kaur will defend her thesis on 20th of April 2018 at 2:00 pm on the subject “Long range time transfer using optical fiber links and cross comparison with satellite based methods”, realized in SYRTE under the direction of Philip Tuckey and the supervision of Paul-Eric Pottie.

The defense will take place in the amphitheater of the Institut d’Astrophysique de Paris (IAP).

=> Abstract.

27th of March 2018 (Paris) – PhD defense of François Tricot

François Tricot will defend his thesis on 27th of March 2018 at 1:30 pm on the subject “Analysis and reduction of the frequency instability noise sources in a compact CPT clock”, realized in SYRTE under the direction of Stéphane Guérandel.

The defense will take place in the amphitheater of the Institut d’Astrophysique de Paris (IAP), in front of the jury: Agnès Maître, Frédéric Du Burck, Vincent Giordano, Virgile Hermann and Jean-Marc Lesage.

Abstract: This thesis work has been granted by a CIFRE-Défense contract to study the frequency stabilities of an atomic clock based on coherent population trapping. The objective is to demonstrate a frequency stability in the range of 10-13τ-1/2 up to 10 000 s. A caesium vapour cell is used with a high-contrast excitation scheme using cross linear polarisations and a Ramsey interrogation. The short-term frequency stability is presented with the reduction of the phase and the laser power noise, both limiting clock performance at 1 s integration time. The optimisation of the microwave chain with a new local oscillator, and the implementation of a very low noise power lock loop have improved the frequency stability down to 2,3×10-13 at 1 s integration time. The fluctuations analysis of the operating parameters (laser intensity, magnetic field, temperature, etc.) and the measurement of the clock frequency show that the medium-term frequency instability is mostly limited by laser power and magnetic field fluctuations at the level of 2×10-14 at 2 000 s integration time. These analyses also show that laser power fluctuations, despite servo loop control, are related to polarisation fluctuations through temperature fluctuations inside the experiment isolation box. Finally, the studies of a dual-frequency and dual-polarisation laser for a compact CPT clock are presented, paving the way to industrialisation by reducing the optical bench.

Key words: atomic clock, vapour cell, coherent population trapping, Ramsey fringes, Dick effect, intensity noise, frequency stability.

2nd level Specializing Master’s Programme in Photonics for Data Networks and Metrology

Data traffic will experience a dramatic growth over the next years driven by 5G access, high-definition video, virtual and augmented-reality contents, and the considerable growth in cloud services due to Big Data Exchange. Photonic data networks will be required to be more and more pervasive and elastic, to supporting the paradigm of Internet of Thing and to enabling Industry 4.0.
Besides data transport, photonic networks will also distribute time and frequency (T/F) standards for research and industry, enabling orders of magnitude performance improvements with respect to satellite systems, over continental geographical areas.
The list of institutions supporting the initiative testifies the need for a vertical multidisciplinary knowledge, from the transmission layer up to the IP layer, and training such new professional figures is indeed the mission of the 2nd level Specializing Master’s Programme.
The Programme is supported by the EU through the project H2020-INFRAINNOV-CLONETS and will offer theoretical and practical lecturing, hand-on experiences and a final internship in European industrial and/or research environments.
Deadline for appliance: May 7th 2018.

EFTF 2018: Call for papers

April 9th to 12th, 2018 at conference centre of the Museo dell’Automobile in Torino (Italy).

The European Frequency and Time Forum (EFTF) is an international conference and exhibition, providing information on recent advances and trends of scientific research and industrial development in the fields of Frequency and Time.

Authors are invited to submit abstracts of recent and original work of interest to the frequency control communities in the following topics:

  • Group 1: Materials, Resonators & Resonator Circuits
  • Group 2: Oscillators, Synthesizers, Noise, & Circuit Techniques
  • Group 3: Microwave Frequency Standards & Applications
  • Group 4: Sensors & Transducers
  • Group 5: Timekeeping, Time and Frequency Transfer, GNSS Applications
  • Group 6:  Optical Frequency Standards and Applications

Abstracts will be collected through a web-based submission tool.

Abstract Submission deadline: December 22nd, 2017

=> Details on abstract submission and conference information.

24th of November 2017 (Paris) – PhD defense of Denis Savoie

Denis Savoie will defend his thesis on 24th November 2017 at 2 pm on the subject “Continuous and interleaved operation of a cold atom gyroscope and improvement of its stability”, realized at SYRTE laboratory under the direction of Arnaud Landragin and co-supervised by Remi Geiger.

The defense will take place in the main amphitheater of the Institut d’Astrophysique de Paris.

21st of November 2017 (Paris) – PhD defense of Romain Bouchand

Romain Bouchand will defend his thesis on 21st November 2017 at 4 pm on the subject “Optical frequency comb-based ultralow phase noise photonic microwave generation”, realized at SYRTE laboratory under the direction of Yann Lecoq.

The defense will take place in the main amphitheater of the Institut d’Astrophysique de Paris.

The defense will be in english.

10th of November 2017 (Paris) – PhD defense of Slawomir Bilicki

Slawomir Bilicki will defend his thesis on 10th November 2017 at 2 pm on the subject “Strontium optical lattice clocks: clock comparisons for timescales and fundamental physics applications”, realized at SYRTE laboratory under direction of Sébastien Bize and supervised by Jérôme Lodewyck.

The defense will take place in the main amphitheater of the Institut d’Astrophysique de Paris.

The defense will be in english.