At CELIA laboratory, the COLA (Centre Optique et Laser en Aquitaine) laser facilities is supported by two homemade femtosecond Ti:sapphire lasers based on the Chirped Pulse Amplification (CPA) scheme. Their main characteristics are summarised below :
|Laser||Beamlines||Experimental areas||Pulse duration||Compressed energy||Repetition rate||Wavelength|
|Aurore||2||3||35 fs||2 x 7mJ||1 kHz||810 nm|
|TOPAS||1||50 fs||> 500 μJ||1 kHz||1,2 – 2,2 μm|
|Eclipse||1||1||40 fs||5 mJ||100 Hz||810 nm|
|1||2||40 fs||170 mJ||10 Hz||810 nm|
The first laser facility, working at 1 kHz repetition rate called Aurore laser, is dedicated to VUV-XUV high order harmonic generation and multi-keV X-ray sources. These secondary sources are continuously improved and are used as pump or/and probe beam in different field of physics from atomic and molecular spectroscopy, to solid state physics and X-ray plasma diagnostics …. From end 2008, Aurore laser has integrated diode pumping technology through new commercial frequency doubled Nd:YLF laser pumping Ti:sapphire and powerfull cryogenic amplifier. The increasing of average power (up to 22 W) allows us to provide simultaneously beam laser in two experimental areas. As a complementary source, a commercial optical parametric amplifier (TOPAS) has been installed on one kHz beamline. It delivers between 500 µJ and 1.2 mJ of 50 fs pulses with a tunable central wavelength between 1.2 µm and 2.2 µm. The Aurore facility associates one laser room and three experimental areas with air compressors.
The second laser facility called Eclipse has two beamlines delivering compressed pulses of 5 mJ at 100 Hz and 170 mJ at 10 Hz. At this energy level, vacuum compressor has been implanted in two experimental areas. Eclipse laser is more dedicated to generate brigth XUV attosecond pulse and hard X-ray sources (10-100 keV). Eclipse laser has been operating at full energy and with online characterization of the main laser parameters since September 2008. The Eclipse facility associates one laser room and three experimental areas with vacuum compressors.
Since march 2009, COLA facilities has joined the Laserlab-Europe2 I3 consortium as a beamline provider of European Transnational Access. It includes the providing of laser and/or secondary sources (VUV, XUV, X). In the same time, COLA has joined LOA and SLIC facilities to offer a free of charge beam access to french research groups. Both allocated beamtime, 8 weeks/year in LaserLab program and 5 weeks/year in national access, are selected through call for experimental proposals and scientific committee.