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Laser Physics Laboratory is affiliated both to CNRS and to University Paris 13. We study the interactions between light and matter.

Our experiments range from the most fundamental aspects of basic science to applied research: quantum physics, atomic and molecular physics, optical devices, biomedical imaging...

The lab is structured into eight experimental research teams, four shops and an administrative department. It is composed of about seventy-five people (10 CNRS full-time researchers, 30 university teaching staff members, a technical staff of 15 people, about 20 PhD students and post-docs), plus several short-term trainees and foreign visitors.

Olivier Gorceix,
Director of laboratory

DEC
19
2014
The vibration modes of a quantum gas revealed by statistical analysis of images

The scissors mode, corresponding to an oscillation of the atomic cloud around its long axis, is clearly visible on this component.Ultra cold gases present a very rich dynamics driven by quantum physics. The gas vibration modes depend on the atomic interactions and on the detail of the trapping potential. In order to observe these modes, successive images of the moving atomic cloud are taken, directly in the trap. Until now, the resulting pictures were analyzed by fitting the density profiles with a theoretical model. This only gives access to a limited number of parameters, such as the atom number or the cloud size. This approach prevents from getting all the information present in the images. Inspired by a statistical technique already used in biophysics or astronomy, Principal Component Analysis (PCA), the BEC group at LPL has succeeded in observing for the first time the real shape of all the vibration modes simultaneously excited in an ultra cold gas, as well as their frequencies.



See the video abstractThis work is published as a Fast Track Communication in New Journal of Physics. See also the video abstract.



Caption: The scissors mode, corresponding to an oscillation of the atomic cloud around its long axis, is clearly visible on this component.


DEC
15
2014
Karina Merloti received the thesis prize of the 'NanoK'

Karina MerlotiKarina Merloti (team Bose-Einstein Condensates) received the thesis prize of the 'NanoK' network on nanosciences and cold atoms in the Cold Atoms category, for her thesis entitled "Bose-Einstein condensate in a dressed trap: collective modes in a two-dimensional superfluid".



The prize was awarded by Michèle Leduc in Paris on December 3, 2014.


See also other news below ...

Science news of the laboratory
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The awards and honors members of the laboratory
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General news of laboratory
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