POST-DOC OFFER at FEMTO-ST– Besançon, France

Development of a stabilized laser on a sub-Kelvin Fabry-Perot cavity

Laboratory: FEMTO-ST– Besançon, France

Summary: Ultra-stable lasers have a central role in numerous scientific experiments for high precision measurements: atomic spectroscopy, diffusion of time & frequency signals by optical fiber, detection of gravitational waves and dark matter research. The performances are currently reaching fractional frequency stabilities below 10-16 at 1 second of integration. However, it is still insufficient for many applications including fundamental physics tests and optical atomic clocks. To overcome the current limits, the proposed offer consists in studying as finely as possible the behavior of a Fabry-Pérot cavity at 1 K, which will be used to stabilize a laser in frequency.

Offer details:

  • Prerequisites : PhD in Physics
  • Desired skills: Optical frequency metrology, Gaussian optics in free-space, Analog, digital and radio-frequency electronics, Control theory and locking/feedback techniques, Instrumentation, Cryogenic and ultra-high vacuum, Analysis and interpretation of noise and sources of noises
  • Contract duration : 1 year
  • Salary : approximately €2300 net
  • Procedure : Send CV, cover letter and at least 1 reference letter to

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Research engineer with expertise in instrumentation

We are hiring a research engineer with expertise in instrumentation to coordinate the construction and commissioning of the MIGA instrument (Gravitational Antenna based on Atomic Inetrferometry) at the LSBB site.
This fixed-term contract will start as soon as possible at the LSBB Laboratory in Rustrel, Vaucluse, in the Parc Naturel Régional du Luberon in Provence (France), for a renewable period of 12 months.

Post-doctorate position : Hydrogen deceleration for its first observation of the Gravitational Quantum States

This project aims to perform the first observation of Gravitational Quantum States on
hydrogens in flight. This experiment is part of the international collaboration GRASIAN: GRAvity Spectroscopy and Interferometry with ultra-cold Atoms and Neutrons (

Full time postdoctorate, mainly experimental position. 12 months contract (possibility of extension).

Start date: February 2024 January 2025.

Location: Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS, Collège de France. 4 place Jussieu, 75005 Paris

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Assistant professor position, Sorbonne Université, SYRTE laboratory, Paris (section 30).

The Systèmes de Référence Temps-Espace (SYRTE) laboratory carries out research in the field of fundamental astronomy, time and frequency metrology and sensor, and history of astronomy. A pioneering institution in their deveopment, it studies different types of cold-atom-based quantum sensors: microwave clocks, optical clocks and inertial sensors (gyrometers, gravimeters, gradiometers, chip-scale interformeters). These sensors have demonstrated a remarkable efficiency for realizing measurement instruments of unprecedented performances, for innovative applications in different disciplinary fields: geophysics, fundamental metrology, tests of fundamental laws of physics, positionning and navigation. In order to overcome sensitivity limits of these sensors, or improve their compactnes to turn them into transportable devices, it is important to utilize ressources offered by quantum mechanics, which have been, so far, little exploited for space-time measurement. These protocols include, as exemples, optimal quantum control, non-demolition measurement and preparation of squeezed states for measurement beyond the standard quantum limit, or even entanglement between different sensors. The SYRTE laboratory wants to hire an Assistant Professor in  quantum physics to work in the specific domain of quantum protocoles applied to cold atoms sensors, in order to improve their limits in terms of sensitivity, and strengthen its position in ahighly competitive domain at the international scale.

Candidates (M/F) may contact the relevant group leaders::

– Optical Frequancy Metrology: contact Jérôme Lodewyck (

– Atomic Interferometry and inertial sensors: contact Franck Pereira Dos Santos (

– Microwave references and timescales: contact Stéphane Guérandel (

or the director of the SYRTE laboratory: Arnaud Landragin (

Search for R&D electronics engineer

AR Electronique develops and manufactures in Besançon (France) a wide range of time-frequency products, covering quartz resonators (AT, SC), high-stability oscillators (XO, VCXO, TCXO, OCXO), piezoelectric filters (BAW resonators, all types), as well as numerous systems and frequency sources with very diverse characteristics.

AR Electronique is currently looking for an R&D electronics engineer to meet the needs of its growing business.


Several Postdoc positions at SYRTE, Observatoire de Paris, Paris.

Several Postdoc positions in the Atom Interferometry and Inertial Sensors team SYRTE (Observatoire de Paris), Paris. These positions are funded by the French Quantum Plan and other national and international research projects. Details on the positions listed below, as well as associated contact names, can be found at  and also here PostdocPositionsatSYRTE_2023.

Different PhD and Postdoc positions at SYRTE, Obervatoire de Paris, Paris.

Different PhD and Postdoc positions in the Atom Interferometry and Inertial Sensors team SYRTE (Observatoire de Paris), Paris. These positions are funded by the French Quantum Plan and other national and international research projects. Details on the positions listed below, as well as associated contact names, can be found at and also here PhDandPostdocPositionsatSYRTE_2023.

Project engineer for Equipex+ T-REFIMEVE, at LPL, Sorbonne Paris Nord University, 2-year fixed-term contract, renewable.

The project engineer will participate in the scientific and technical development of the Equipex+ T-REFIMEVE, in particular for the deployment, operation and maintenance of the fiber links of the REFIMEVE network. She/He will also contribute to the coordination with the partners using the equipment and to the management of T-REFIMEVE.

If interested, please contact Professor Anne AMY-KLEIN, head of T-REFIMEVE, and send your application (CV and cover letter) to

Starting date: to be filled immediately. 2-year fixed-term contract, renewable, Research Engineer level category A+

For more details, please see the job description here 2023 09 28 poste ingénieur projet T-REFIMEVE.