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

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 22^nd june) will be about all optical materials: Optical Glass, Filter Glass, Coated Filters, Fused Silica and Calcium Fluoride

The second day (Friday 23^rd 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 : http://cct.cnes.fr/content/cct-ooe-20170622-optical-materials

If you are not member of the European Union and you wish to attend this workshop, please contact: Cedric VIRMONTOIS, Optical CCT manager (cedric.virmontois@cnes.fr)

First “call for papers” of the 31st European Frequency and Time Forum and the 71st consecutive meeting of the IEEE International Frequency Control Symposium which will be held as our 7th joint conference in Besançon, France, July 9th-13th 2017

Abstract submission deadline: March 3, 2017

=> More informations

It will be openly available until the end of 2016 and can be obtained from:
http://iopscience.iop.org/article/10.1088/0034-4885/79/10/106801?utm_medium=email&utm_source=iop&utm_term=ropp%2C+reviews&utm_content=ROPP%3A%20Physical%20applications%20of%20GPS%20geodesy%3A%20a%20review&utm_campaign=9653

This workshop, organized by Olivier Dullieu (LAC) and Laurent Hilico (LKB), follows the workshops organized in Sandbjerg (Denmark) in 2011, Arosa (2013) and Bad Honnef (2015), and focuses on cold molecular ion physics.

Within a five half-days program with invited and selected oral contributions as well as poster sessions, it will address recent experimental and theoretical achievements in molecular ion spectroscopy, molecular ion-neutral collisions, cold chemistry, quantum logic protocols towards precision measurements and fundamental constant determination.

The participation of young researchers in the field is strongly encouraged. The attendance is limited to 70 persons, so early registration is recommended.

The website of this conference supplies further information about registration, deadlines, venue and submission of contributions. It can be found at  http://www.lkb.upmc.fr/iontrap/2017-cold-molec-ion-home/

Paul Dumont will defend his thesis on Dec. 8th, 2016 at 13:30, Institut d’Oprique (Palaiseau) on the subject “Dual-frequency optically-pumped semiconductor laser for atomic clocks based on coherent population trapping of cesium atoms”. This work has been realized at LCF – Laboratoire Charles Fabry under the supervision of Gaelle Lucas-Leclin and Patrick Georges. This thesis has been co-funded by FIRST-TF.

=> More information

Ariane 5 ES (VA 233) will be launched with 4 GALILEO satellites on-board. These 15th, 16th, 17th, 18th satellites have been named Antonianna, Lisa, Kimberley, et Tijmen, following a competition organized by the European Commission to give the opportunity to the children winners of the contest to give their name to GALILEO components. The launch can be followed in real time at the address:
https://ariane.cnes.fr/fr/live
The webcast start time will be in 2 parts: 13:46 to 14:30, then 17:30 to 18:30 (Paris time)

The workshop is jointly organized by the GdR Atomes Froids and IFRAF – Institut Francilien pour la Recherche sur les Atomes Froids. Confirmed invited speakers include P. Bouyer, A. Browaeys, J. Dalibard, M. Greiner, C. Klempt, J. Lodewyck, A. Rauschenbeutel and J. Ye.

Registration is free, but please register quickly so that we know how many visitors to expect, calibrate the lunch buffet etc. The deadline for registration is Friday, November 25.

There will be a poster session, for which contributions are welcome. As space is limited, we suggest to limit to one poster per team.

Registration and poster submission:

aftq16.sciencesconf.org

Looking forward to seeing you on December 02,

Robin Kaiser
Michèle Leduc
Jakob Reichel

The defense will take place in Amphithéâtre Mesnage, ENSMM, 26 rue de l’Epitaphe, Besançon

More information