The L3 HAPLS pump engine with design pulse energy of 200 J employs two Nd-doped glass amplifiers operating at 10 Hz and cooled by helium gas. Each amplifier is pumped by high power laser diode arrays, each providing an 800-kW peak power. These are the highest peak-power pulsed laser diode arrays in the world.
The femtosecond pulses are generated in a titanium-doped sapphire amplifier.
The L3 HAPLS system will also include real-time controls and a timing system, which will make it possible to synchronize its operation to the facility’s electronic master clock and later to a femtosecond-precision laser clock.
L3-HAPLS: High repetition rate Advanced Petawatt Laser System Schematic February 2021
| Design parameters | Current parameters (Feb 2021) |
|
| Output pulse energy (main beam compressed) | >30 J in single aperture | 13.3 J in single aperture |
| Pulse duration | <30 fs FWHM | 27.3 fs FWHM |
| Repetition rate | 10 Hz | 3.3 Hz |
| Peak power | 1 PW | 490 TW |
| Power contrast | Initial 1:10-9 @ 50 ps, then optimized at ELI to 1:10-11 @ 50 ps | |
| Pump laser technology | DPSSL | DPSSL |
| Short pulse laser technology | CPA: Ti:sapphire single aperture | CPA: Ti:sapphire single aperture |
| Output laser pulse energy RMS stability | Better than 0.6% rms | |
| Output laser beam RMS pointing stability | <10 µrad | 2 µrad RMS radial |
| Beam format | Rectangular superGaussian, single aperture | Rectangular superGaussian, single aperture |
| Beam size of compressed beam | 214×214 mm | 214×214 mm |
| Beam quality (encircled energy in a diffraction limited spot) | 0.5 |
L3 Experimental programme:
References:
Bedřich Rus, bedrich.rus@eli-beams.eu
The video of HAPLS:
L3 HAPLS laser
L3 during D8 run
PW compressor
