LUCA is a multi-line (up to 6) and multi-user (up to 5) facility that provides 800 nm, 50 fs pulses with peak power ranging from 30GW to 2TW at 20Hz. LUCA includes three sub-systems, respectively called “Booster”, “FemtoI”, “FemtoII”, that all use Titanium-sapphire as the laser medium.
Synoptic of LUCA
LUCA can accommodate up to 5 experiments simultaneously
The Femto I subsystem comprises a “low energy” line and a “high energy” line delivering 50fs pulses at 800nm with 1.5mJ and 12mJ per pulse respectively. The high energy line can be used to pump an in-house developed NOPA that provides 10-20µJ pulses between 500 and 700nm (5% conversion efficiency) with 30fs typical pulse duration. Femto I is mostly used for pump-probe experiments in femtochemistry : an advanced femtochemistry work-station operated by the LFP/DyR Group is permanently available to study reaction dynamics in the gas phase with focus on organic molecules, radicals and carbenes, small biomolecules and clusters of these species up to nanoparticles. The workstation includes a versatile molecular beam source with a Velocity Map Imaging device and a Time-of-Flight mass spectrometer.
Femto II, LUCA’s most intense beamline, provides 50fs, 100mJ pulses at 800nm that can be delivered to 3 experimental areas. Thanks to spatial filtering based on the modal filtering technique, wave-front distortions are limited to λ/8. Pulses at 400nm with energy beyond 13mJ and 45fs duration are also available using the internally developed achromatic Second Harmonic Generator. Several workstations are permanently offered to carry out laser-matter interaction studies at high intensity. For instance, an original set-up based on spectral interferometry is proposed by the LSI/ILS group for solid-state physics. The LIDYL/ATTO group operates a workstation dedicated to gas phase studies using ultrashort (fs to as) XUV pulses combined with intense IR fs pulses. A workstation for nanoscale lensless imaging is also available.
Finally, the “Booster” line provides 10mJ, 45fs pulses at 800nm devoted to laser R&D and to laser ablation studies conducted by the Nuclear Energy Division of CEA.