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Centre Laser Infrarouge of Orsay (CLIO)
Hosting Legal Entity
French National Center for Scientific Research / Centre National de la Recherche Scientifique (CNRS)
3 Michel-Ange street, CNRS, Paris, PO: 75794, Ile-de-France (France)
15, avenue Jean Perrin, Laboratoire de Chimie Physique, Université Paris Sud, Bât. 349, Orsay, PO: 91405, Île-de-France (France)
Type Of RI
Coordinating Country
Current Status:
Operational since 1995
Scientific Description
CLIO (Centre Laser Infrarouge d’Orsay) is a pulsed free-electron laser user facility producing a high peak power and continously tunable wavelength laser beam in the mid-infrared spectral range between 3 and 120 µm. It has a double pulsed structure: "macro-pulses" 10 µs long (at 1 to 25 Hz) contain "micro-pulses", of length adjustable from 0.3 to 5 ps (with Fourier transform spectral width). The micropulse interval is 16 ns. A purged beam line transports the optical beam to eight user rooms. They include various equipment : mirrors, detectors, optical mounts, monochromators, cryostats, etc. Users have computer control of the laser wavelength and spectral scans. In addition, four different set-ups are operated by permanent scientists and are open users : surface spectroscopy; ultrasensitive molecular spectroscopy (2); near-field microspectroscopy.CLIO is open to the scientific community. Proposals are selected on the basis of scientific merit through an independent peer-review process. The use of CLIO is free of charge for the academic community. The projects have to be submitted by the end of each year.

RI Keywords
Infrared, Free electron laser, Non-linear studies, Spectroscopy
RI Category
Intense Light Sources
Scientific Domain
Physics, Astronomy, Astrophysics and Mathematics
Chemistry and Material Sciences
ESFRI Domain
Physical Sciences and Engineering
User support

information at

Access to laser facilities

free of charge for the academic community.

Pump-probe experiments

Contact: rui Prazeres.

Sum-frequency generation

Contact: Bertrand Busson or Christophe Humbert.

Infrared spectroscopy of molecular ions and mass spectrometry

Contact : Philippe Maitre (FTICR) or Debora Scuderi (RF trap).

AFMIR microscopy

Contact: Jean-Michel Ortega.


tunable between 3 and 120 µm.

Date of last update: 28/02/2019
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