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CNRS - CLIO infrared Free-electron laser

The infrared Free-electron laser facility CLIO will  provide beam time to researchers of the European community. CLIO is very experienced in this operation since it has been granted several successive access contracts in the frame of the TMR, 5th, 6th and 7th PCRD programms. During these, the beam time provided to EEC scientists has always been equal or larger than the initially estimated quantity and has resulted in many publications. The organisation of the EEC users travel and stay is made by the laboratory administrative staff. The technical and scientific advisoring is made by the staff of permanent researchers and technicians. Each permanent experiment is operated by at least one beamline scientist which works with external users. Experimental set-ups brought by external users are installed in cooperation with the FEL scientists attached to the facility.
CLIO Performances

        CLIO is a pulsed free-electron laser  continuously tunable 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. CLIO can lase simultaneously at 2 different, independently tunable frequencies, allowing 2-colours pump-probe experiments.


  Spectral range                            3 to 120 µm        

  Polarization                                linear

  Minimum spectral width Dl/l     0.2 % to 1 %

  Stability in l                                0.1 %

  Macropulse length                     1 to 9 µs        (tunable)

  Micropulse      "                         0.3 to 5 ps        (    "      )

  Peak power                                10 à 100 MW

  Max.average power                   1.5 W ( 25 Hz, 16 ns/micro-pulses)

  2-coulours FEL                          tested up to 32 µm

  OPOs                                         2 - 8 µm


User facility

A vacuum beam line transport the optical beam to 8 user rooms. They include various equipment : mirrors, detectors, optical mounts, monochromators, cryostats, etc. The users have computer control of the laser wavelength and spectral scans. In addition, 4 different set-ups are available. 3 of them are operated by permanent scientists, and include OPOs (2 – 8 µm) in parallel with the FEL :

·                     A surface sum frequency ("SFG") experiment, spectroscopy of molecules adsorbed on surfaces or interfaces.

·                     Several FT-ICR-Mass spectrometers for molecules in gas phase spectroscopy by multiphoton dissociation

·                     A near-field infrared microscope with spatial resolution < 100 nm capable of local spectroscopy

·                     A pump-probe and photon echo experiment (no permanent scientist)

There is a project call once a year (dealine : 15 December)

CLIO infrared Free-electron laser
  Jean Michel Ortega
CLIO/LCP - Université Paris-Sud Bat.201 Porte 2, Orsay 91405 Orsay