Appointment of Dr P. Tavella as the Director of the BIPM Time Department

Dr Tavella is currently a Research Director at the Istituto Nazionale di Ricerca Metrologica (INRIM), responsible for the UTC(IT) Laboratory and the Galileo Timing Research Infrastructure. She is deeply involved in the design and testing of the European GNSS Galileo timing system through more than 30 European projects. Dr Tavella is the previous Chair of the CCTF Working Groups on International Atomic Time (WGTAI) and Algorithms (WG-ALGO).

In addition, Dr Tavella is a Distinguished Lecturer for the Institute of Electrical and Electronics Engineers (IEEE) Ultrasonics, Ferroelectrics and Frequency Control Society (UFFC), a member of the IEEE UFFC Administrative Committee, Vice-Chair of the International Union of Radio Science Commission A (URSI Comm A), and Vice-Chair of the European Frequency and Time Forum (EFTF) Executive Committee.

Dr Tavella has considerable experience of time scales and clock modelling, having conceived, designed, and developed, in collaboration with different colleagues, several methods and techniques for the time scale definition and measurement data treatment. These include possible uses and drawbacks of the Kalman filter in the ensemble time scale; contribution to the ensemble algorithm for a pulsar time scale; and the application of stochastic processes to model the atomic clock deviation and survival time within error thresholds, applied also to the determination of calibration interval.

Official announcement:

Symposium: “The fundamental constants of physics: what are they and what is their role in redefining the SI”

Symposium: “The fundamental constants of physics: what are they and what is their role in redefining the SI”. On 7 September 2017 at BIPM (Sèvres, France).

This symposium is organized by the Consultative Committee for Units (CCU) to celebrate the work accomplished towards a redefinition of the SI in terms of invariant physical constants.

The main topics of the discussion will be: the profound nature of the different fundamental physical constants; the different types of fundamental constants as well as their role in the evolution of physical theory, in particular in gravitation, cosmology and in string theory. The role of the fundamental constants in the forthcoming definition of the SI will be examined.

The Symposium aims at promoting scientific exchange amongst the National Metrology Institutes and leading scientists in the field of fundamental constants.

Deadline for registration: 24 July 2017 on

How best to communicate the revised SI?

The 2017 Communications Workshop on ‘How best to communicate the revised SI?’ is organised by CMI and EURAMET. The event will take place on Tuesday, 17 and Wednesday, 18 October 2017 at CMI, Prague (Czech Republic).

Provided the experimental data are satisfactory, the 26th CGPM in 2018 is expected to accept a resolution to revise the International System of Units (SI).
The possible revision of the SI is an extraordinary opportunity to communicate the importance of metrology and the future SI.
This task is similar for many NMIs and DIs in Europe.

Therefore, EURAMET will organise a two-day workshop on ‘How best to communicate the revised SI?’, hosted by CMI, the Czech National Metrology Institute.

The two-day workshop will contain:
– An introduction to the planned revision of the SI
– Information about the BIPM Brand Book ‘Future Revision of the SI’
– A workshop on how to convey the SI at school
Best practice examples of communicating the SI
Practical sessions on how and when to communicate the future revision of the SI

The workshop is tailored for employees of NMIs and DIs who are working in communications and public relations.
There is no fee for the workshop, but places are limited and registration is essential.
Please forward this announcement to colleagues in your institutes who may find it of interest.

Deadline for registration: Friday, 15 September 2017.
Detailed information and registration:
This training workshop is funded by the Human and Institutional Capacity Building strand of EMPIR in the area of communications.

Discussion Day on the Foundations of Quantum Physics

A Discussion Day on the Foundations of Quantum Physics will take place on 28 August 2017 at the Université de Technologie de Troyes in Troyes (France).

We will hear talks and exchange on issues concerning Quantum Foundations, including experimental work (note that a meeting of the COST Network Nanoscale Quantum Optics will take place immediately after the Discussion Day, for details see

Basic information as well as a preliminary list of speakers of the Discussion Day is available here:

Registration is free but mandatory. Register by sending your name and affiliation.

Possibility of accommodating a very limited number of contributed talks. Abstracts (1/2 page) should be sent before the 16th of July.

Winter school on Physics with Trapped Charged Particles, 8-19 January 2018, Les Houches

In continuing the successful Winter School on the Physics with Trapped Charged Particles held in Les Houches (France) in January 2012 and 2015 (lecture notes available) we are happy to announce the third such school to be held this coming January 2018.  The school will take place from January 8-19, 2018 and applications are now open.
Deadline for applications: September 17th

⇒ More details about the school

30 June 2017 – Thesis defense of Nicolas VON BANDEL

Nicolas VON BANDEL will defend his thesis on 30 June 2017 at 14:00, 0C-140 (Auditorium) – III-V Lab Campus Polytechnique 1 avenue Augustin Fresnel 91767 Palaiseau on the subject “Development and study of low noise laser diodes emitting at 894 nm for compact cesium atomic clocks”. This work was a collaboration between Institut d’Electronique et des Systèmes (Montpellier) and III-V Lab (Palaiseau).

Abstract : This PhD work deals with the design, the fabrication and the study of high-coherence semiconductor laser sources emitting at 894 nm, for application to compact, optically-pumped cesium atomic clocks in an industrial context. We are particularly interested in the electrically pumped ”Distributed-Feedback” in-plane laser diodes (DFB). The aim is to obtain a low-threshold, single-mode laser with high optical efficiency and a linewidth of less than 1 MHz. We first deal with the design and first-order characterization of the DFB diodes until they are put into modules for the clock. We then carry out an in-depth study of the physical properties of the laser emission in terms of coherence time. For that purpose, a new universal method for characterizing the optical frequency noise is introduced. Finally, we look further into the spectral properties of the emission in a servo configuration on a fluorescence line of the cesium (”Dither-Locking”). We show that the intrinsic properties of the component satisfy the requirements of the industrial system as defined in the study.

Keywords : Laser diodes, low noise, 894nm, cesium atomic clocks, frequency noise metrology, linewidth in servo

Workshop on Optical Materials by SCHOTT, HERAEUS and HELLMA

Within the framework of the CNES CCT “Optics and Optoelectronics Technical Center” and the “Material Technical Center”, a Workshop on Optical Materials by SCHOTT, HERAEUS and HELLMA, will be organized on 22nd & 23rd June 2017 at CNES (Room Leonard de Vinci), Toulouse.

The first day (Thursday 22nd june) will be about all optical materials: Optical Glass, Filter Glass, Coated Filters, Fused Silica and Calcium Fluoride

The second day (Friday 23rd june) will be dedicated to Zerodur® and Infrared optical materials.

The attached agenda details the different items that will be presented. Questions and open discussions will conclude each point.


Register deadline: june 14th.

Detailed program and Registration link :

If you are not member of the European Union and you wish to attend this workshop, please contact: Cedric VIRMONTOIS, Optical CCT manager (