Version FrançaiseEnglish Version

  logo clio

  Centre Laser Infrarouge d'Orsay

cnrsUniversité de Paris Sud   Laboratoire de Chimie Physique 
Introduction :  - Welcome
 - What is a Free-Electron Laser?
 - What for ?
Research topics :
 - A few recent topics
 - Publications
Set-up & performances :  - Accelerator
 - Laser
Experimental rooms:  - Diagnostics room
 - AFMIR-PTIR Microscopy
 - Sum-frequency generation
 - FT-ICR spectrometry
 - Development
CLIO beamtime:  - Ask for CLIO beamtime
 - Refunding
Table top lasers:  - Forms
Links :
 -  Free-electrons lasers around the world
Infos & contacts :
 - Where ?
 - Who ?

What for ?

CLIO is an infrared, pulsed and tunable free-electron laser.

Infrared : the energy of infrared photons corresponds to the vibration and rotation modes of molecules, or to the bandgap of some semiconductors, for example.

Tunable :  the full tunability of the free-electron laser over a wide spectral range allows one to scan for the specific infrared spectrum of a molecule or target directly one of its absorption peak.

Pulsed : the laser bursts are picoseconds (10-12s) long. Phenomena with this temporal scale or longer can then be investigated, for cinematic studies. High peak powers usually come with short pulses : 10-100 MW is enough to trigger non-linear effects (multiphoton absorption).
All these features allow to do some (rather fundamental) studies in chemistry or physics and answer questions like :
  • How behave molecules at the surface of an electrode in electrochemistry ?
  • What kind of reactional intermediate appears in a chemical reaction ?
  • What is the lifetime of an excited state in a quantum dot ('artificial atom') ? Is it possible to achieve population inversion in such a system, and how much optical gain is available ?
  • Is it possible to do some 'chemical mapping' of a bacterium by coupling the laser with a microscope ? What is the best spatial resolution achievable ? (beating the diffraction limit !)
  • ...
© 2012 LCP