Baptiste Battelier

Author's posts

[Ph D position] Interferometry with coherent atom sources for Space and Inertial Navigation

The ICE project aims to develop a matter wave interferometer with two atomic species operating in microgravity. The development of a portable experiment for free fall test (airbus 0g) is underway in collaboration with SYRTE and led to the world’s first demonstration of the use of atomic inertial sensor onboard and microgravity. Ultimately, we will carry out an initial comparison of atomic accelerometers with two different atomic species (potassium and rubidium) at 10 pm/s2, allowing to test the universality of free fall (equivalence principle). The project objectives are the validation of the various technical and technological choices being made on the experiment and a new design of an improved version with a coherent source (Bose Einstein condensate) using the full potential of microgravity.

The first test of the weak equivalence principle in microgravity thanks to a double species atom interferometer Rubidium/Potassium was achieved in May 2015. This technical prowess constitutes an important step, but there is still a lot of effort to supply in order to achieve a very high accurate test benefiting fully from micro-gravity. Today, there are many limitations: vibrations and trajectory of the plane, atom temperature, and systematics. The goal of the study will be to push back these limitations to approach the ultimate sensitivity. The development of this new generation of sensor is based on the using of an ultra-cold bi-species degenerated gas. To reach this goal, the setting up of a dipole trap with a fibered laser source to cool the atom cloud is planned. Studies will be led to get the most collimated atom source possible in order to limit the velocity dispersion, hence to limit the contrast loss for long interrogation times. To reach this goal, as well as the dipole trap, optics for atoms (lens, Bragg grating…) should be set up thanks to light beams. At last, a spatial imaging system will be put in place in order to increase the amount of information extracted from the measurement.

In parallel with the onboard experiments, a micro-gravity simulator installed in the laboratory will allow to put the experiment chamber and the measurement instruments (200 kg) in weightlessness during 500 ms, and in a highly repetitive way. In the manner of the plane experiment, atoms stayed at the center of the vacuum chamber, which allows the interrogation time without changing the environment (magnetic, optical…) of the experimental measurement.

The second goal of the thesis will be to push the development of a compact multi-axis inertial atom sensor. Indeed, beyond the tests of fundamental physics, the project also allows to explore potential applications with cold atom interferometers, such as inertial navigation. The realization of the multi-axis system will allow to do measurements of acceleration and rotation along the three axis of space and have a fully cold atoms inertial station to hand. To achieve all the necessary measurement, the Ph. D. student will have to test different architectures of atom interferometry. Since the experiment is on-board, tests in relevant environment are planned. This study with ultra-cold atoms complete prospectively the research activities with iXBlue.

The work will take place at LP2N within Institut d’Optique d’Aquitaine, with regular contacts with the company iXBlue for inertial navigation points. The candidate will be asked an advanced expertise in the following fields: atom physics and ultra-cold gas, laser, electronics, servo lock systems, computer science and signal processing.

 

Contact :B. BATTELIER

Email : baptiste.battelier@institutoptique.fr

Tel : +33 5 40 00 27 01

www.ice-space.fr

http://www.lp2n.institutoptique.fr/

 

directeur de thèse:P. BOUYER

Directeur du LP2N

Laboratoire Photonique, Numérique et Nanosciences

UMR5298 – LP2N

IOGS – CNRS – Université Bordeaux

 

Institut d’Optique d’Aquitaine

Rue François Mitterrand

33400 TALENCE

 

philippe.bouyer@institutoptique.fr

Tel : +33 5 40 00 37 94

Mob : +33 6 22 96 92 36

Fax : +33 1 72 70 35 76

[Ph D position] Compact laser source for an onboard matter-waves inertial sensor

Spectacular improvement has been achieved in laser cooled atom physics during the two last decades. The ability to manipulate and control cold atoms associated to various accurate measurements allowed the development of matter waves interferometers having measurement noise and long term stability excellent enough to make them candidate for a technological breakthrough in the field of inertial sensors. Nowadays, substantial technical developments have been done and have allowed to bring to market atom gravimeters and clocks enabling static long term measurements. Nevertheless, the use of cold atoms sensors for navigation and positioning still needs to solve a lot of scientific and technological challenges such as compliance with onboard applications and compactness, measurement continuity, operating these sensors in relevant environment and in contact with other measurement instrumentation.

The Joint Laboratory iXAtom brings together the knowledge of a French company of very high technological added value- iXBlue, expert in photonics and inertial navigation of very high performance – and a public laboratory specialized in atom interferometry at the highest worldwide level- LP2N. The goal of the joint laboratory is to bring a technological breakthrough using cold atoms to develop the next generation of inertial sensors for industrial, space and military applications, with an expected improvement of the performances by several orders of magnitude with a device of same size.

The laser system constitutes an essential part of matter wave sensors. Electronics included, this subsystem is very complex and demands a specific and very advanced development for onboard devices. With this avowed goal, LP2N developed an expertise in fibered lasers based on components coming from telecommunication field associated with a frequency doubling stage in order to reach the wavelength of the atomic transition of Rubidium. This laser technology has been tested on ICE experiment on board the ZERO-G plane and on compact prototypes of atom gravimeters and clocks.

The goal of this study is the manipulation of matter-waves thanks to a new generation compact laser source. This device will be developed during these three years and will be tested on the cold atom interferometry experiments and prototypes available in our laboratory. In particular, the purpose will be to validate all the key phases of an inertial measurement with cold atoms: cooling, preparation of states, interferometry and detection. Moreover, environmental and onboard tests will be done both with the means provided by the industrial partner iXBlue, and on the experiment installed on the ZERO-G plane making parabolic flights (ICE).

The first efforts done by the laboratory and the industrial partners on ICE experiment and gravimeters for field applications have to be kept up for inertial navigation in order to pass a new key step in compactness and reliability, especially to boost the compliance with onboard applications. The goal of the PhD. Student will consist in developing an ultra-compact laser source for an onboard accelerometer. Firstly, he will define the needs applied to inertial navigation targeting a level of performance adapted to a relevant compactness and taking into account some aspects such as power consumption and the weight. Then, the student will design and produce the laser system including optical components, control electronics and microwaves signal generation. All the functions will be studied especially the servo lock method, sideband generation, power and polarization control. During this study, it is also planned to develop and characterize key photonic or electro-optic components which can allow to simplify the laser system.

The candidate will be asked an advanced expertise in the following fields: optics and photonics, laser, electronics, servo lock systems, computer science. Knowledge in atom physics and ultra-cold gas can be a plus. The Ph D. student will have strong contact with the development team at IxBlue in Besançon in order to develop specific components.

 

 

Equipe/service : Groupe Cold Atoms in Bordeaux LP2N. Laboratoire commun IXAtom

 

 

Localisation : Talence (France)

 

Profil recherché : Etudiant en master/école d’ingénieur niveau M2 dans une formation spécialisée en optique/photonique

 

Date de début : 1er octobre 2017

 

Durée : 3 ans

 

Financement : Thèse CIFRE IxBlue Garanti 100%

 

Contact LP2N: B. BATTELIER Email : baptiste.battelier@institutoptique.fr

Tel : 05 57 01 72 24

http://www.lp2n.institutoptique.fr/

 

Contact IxBlue : H. PORTE E-mail : henri.porte@ixblue.com

 

directeur de thèse: P. BOUYER Directeur du LP2N

Laboratoire Photonique, Numérique et Nanosciences

UMR5298 – LP2N IOGS – CNRS – Université Bordeaux

Institut d’Optique d’Aquitaine

Rue François Mitterrand

33400 TALENCE

philippe.bouyer@institutoptique.fr

Tel : +33 5 57 01 72 00

Mob : +33 6 22 96 92 36

Fax : +33 1 72 70 35 76

[Internship M2] Matter-waves manipulation with a compact laser system for onboard applications

The Joint Laboratory iXAtom brings together the knowledge of a French company of very high technological added value- iXBlue, expert in photonics and inertial navigation of very high performance – and a public laboratory specialized in atom interferometry at the highest worldwide level- LP2N. The goal of the joint laboratory is to bring a technological breakthrough using cold atoms to develop the next generation of inertial sensors for industrial, space and military applications, with an expected improvement of the performances by several orders of magnitude with a device of same size.

The laser system constitutes an essential part of matter wave sensors. Electronics included, this subsystem is very complex and demands a specific and very advanced development for on-board devices. With this avowed goal, LP2N developed an expertise in fibered lasers based on components coming from telecommunication field associated with a frequency doubling stage in order to reach the wavelength of the atomic transition of Rubidium.

This internship will focus on matter-waves manipulation with a new laser system. With the aim of miniaturizing this laser system and make it more reliable, this internship will focus on the ability of simplifying the servo control of the laser frequency. For our applications, the laser frequency has to be controlled with an accuracy and a stability below 1 MHz.  The standard method consists in servo locking the source on a Rubidium cell (after frequency doubling) by saturated absorption. Nevertheless, this apparatus is not easy to implement in our architectures, especially because of the dedicated doubling frequency stage. The goal of this internship will be to servo lock a laser diode emitting at 1560.48 nm with alternative solutions compliant with on-board applications. The student will define the specifications and will have to lead an advanced study on the diode laser stability. Then a review of different solutions will be done including for example servo lock methods on a stabilized cavity, or on a reference gas cell. When the solutions are selected, they will be implemented for an experimental validation.

The laser will be tested on vacuum system containing Rubidium atoms, and the final goal of the internship will be to cool atoms and achieve an atom interferometer in order to validate the functioning.

The candidate will be asked an advanced expertise in the following fields: optics and photonics, laser, electronics, servo lock systems, computer science.

 

 

Prolongation en thèse possible http://www.lp2n.fr/?p=1485 (octobre 2017)

 

Equipe/service : Groupe « Cold Atoms in Bordeaux » LP2N

 

Localisation : Talence (France)

 

Profil recherché : Etudiant en master/école d’ingénieur niveau M2 dans une formation spécialisée en optique/photonique

 

Date de début : 1er mars 2017

 

Durée : 4-6 mois

 

Financement : indemnité journalière de stage (~450 euros/mois)

 

Contacts : Baptiste BATTELIER baptiste.battelier@institutoptique.fr

tel : +33 5 57 01 72 24