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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

AUG
28
2016
Record of precision for atomic clocks comparison over a 1400-km optical link

Research on optical fiber link performed by the group MMT of Laboratoire de physique des lasers (LPL, CNRS/Université Paris 13) and the laboratory Systèmes de référence temps-espace (SYRTE, CNRS/Observatoire de Paris/UPMC, associated to LNE), have just contributed to a new clock measurement with an unprecedented resolution. By linking Paris to Braunschweig (in Germany) with an optical fiber link of 1400 km, the ticking rates of two ultrastable optical clocks, developed at SYRTE and Physikalisch-Technische Bundesanstalt (PTB), and separated by 700 km, were compared. This comparison is 20 times more precise than what was achievable so far using GPS, and the measurement is 10 000 faster for the same resolution. The fractional frequency difference, of 2x10-15, is attributed to an effect of general relativity, which affects clocks at different heights (20 m difference).



The French part of the optical fiber link was established with the support of the French education and research network RENATER. The know-how on the equipment installed on the fiber network is now transmitted to three French companies in the frame of the project REFIMEVE+.

Record of precision for atomic clocks comparison over a 1400-km optical link



This work has been published in Nature Communications on 9 August 2016.

Read the article on Nature Communication’s website.

Press alert (in French).

Visit REFIMEVE+ website for more details.


APR
4
2016
Photo-induced etching at the nanoscale based upon a magnetic trasition

Etching of ZrO2 nanostripe using localized magnetic field oscillating at the frequency of light. The polarization dependence resulted in the different etching profiles. Left: Polarization perpendicular to nanostripe. Right: Polarization parallel to nanostripe. © Takashi YatsuiA work performed in Tokyo in the group of Pr Yatsui, benefiting from a co-operation with Daniel Bloch, team SAI of LPL and with chemists from IS2M (CNRS Mulhouse) initiated after two France-Japan seminars in Nanophotonics (Villetaneuse 2010, et Toba 2011), shows that optical etching can use the magnetic component of the irradiating light. In the vicinity of a nanostructured preform of ZrO2, the irradiation by a continuous wave He-Cd laser (Lambda=325 nm) allows the local photodissociation of the neighbouring O2 molecules, in a process based upon a magnetic transition (M1), often assumed to be negligible, but here locally enhanced by the nanostructured field. This work, freshly published in "Light: Science and Applications" opens new directions, through novel etching processes for nanofabrication.



See also the research news from Tokyo University.


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Science news of the laboratory
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