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.

Urgent search of candidates for two Ph-D theses cofunded by CNES

Two laboratories are searching candidates for a Ph-D theses cofunded by CNES:

6th European Frequency and Time Seminar (EFTS)

The EFTS is intended to provide education and training, including laboratory practice in a full-week seminar, and targets the broadest audience: Engineers, Ph.D. students, post-docs, young scientists, newcomers, etc.

This seminar is original in the following:

  • Broad spectrum of topics related to time and frequency
  • Broad target audience, yet keeping high level education
  • Balance between academic and applied issues
  • Laboratory sessions (not only demos, the attendees are expected to practice on a wide range of instruments made available)

⇒ Information and Registration

ANR – JST joint call for two CREST research areas: “Quantum technologies”

JST and the French National Research Agency (Agence Nationale de la Recherche; “ANR”) concluded a Framework Agreement in December 2017.

The purpose of this Agreement is to foster Japanese-French collaboration in scientific research and to fund joint research projects conducted by Japanese and French partners eligible for funding from each agenc on:
Quantum technology: Creation of an innovative quantum technology platform based on the advanced control of quantum states

The full description of the two areas is appended to the document on the national regulations for French applicants.

The proposals should be led by a Japanese PI and a French PI and will be evaluated via a peer-review procedure by JST and ANR. The call is open to public and private partners.

The average ANR funding will be around 500 k€ per project depending on the number of partners and the ambition of the project, for a 5-year duration.

The JST-CREST call will be launched at a later date for non-joint proposals but the Japanese-French consortia must have submitted their proposals to ANR website before April 16th, 10AM CET.

⇒ More information: http://anr.fr/CREST-2018

21st of December (2017) – Thesis defense of Mehdi Langlois

Mehdi Langlois will defend his thesis on 21st of December at 15:00 on the subject “Design and realisation of a cold atom gravity gradiometer”, realized in SYRTE under the direction of Franck Pereira dos Santos and the supervision of Sébastien Merlet.

The defense will take place in the amphitheater of the Institut d’Astrophysique de Paris (IAP), in front of a jury composed of Christophe Daussy, Laurence Pruvost, Saïda Guellati-Khélifa, Philippe Bouyer and Bruno Desruelle. The entrance will be at 77 avenue Denfer-Rochereau, 75014 Paris.

⇒ More information

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.