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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

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.

Measuring the Boltzmann constant requires care …

Image PRADetermining spectroscopically line parameters of atomic or molecular resonances such as the width or the central frequency calls for some prudence. Well-known from the spectroscopy community, the rule of thumb formulated by Townes and Schawlow states that “The necessary ratio of bandwidth to sweep rate for good portrayal of a line cannot be specified uniquely, but is often of the order of 20” [1]. To go beyond this qualitative advice, we thoroughly modelled the influence of the detection chain with which a spectroscopic signal is recorded and precisely determined the lineshape deformation associated to absorption spectroscopy. Our study predicts artificial frequency shifts, extra broadenings and line asymmetries. This work was conducted in collaboration with F. Rohart (Laboratoire de Physique des Lasers, Atomes et Molécules, Lille) et L. Gianfrani’s group (Molecules and Precision Measurement Laboratory, Naples). It was motivated by efforts carried out in both Naples and Villetaneuse to measure the Boltzmann constant using laser spectroscopy. Indeed, given the targeted part per million uncertainty, determining a linear absorption spectrum Doppler broadening at the same level of accuracy is indispensable.

This work just appeared in Physical Review A and was selected by the editors of Physical Review A to be an Editors' Suggestion.

[1] Townes CH, Schawlow AL. Microwave Spectroscopy. McGraw-Hill, New York, 1955.

See also other news below ...

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