ELI Beamlines | WayForLight

ELI Beamlines is one of the three facilities forming the Extreme Light Infrastructure. It is a multi-laser user facility located southwest of Prague, Czech Republic. The facility will provide focused intensities of up to 10^24 W/cm2, and a high-repetition rate laser system. The facility offers various sources of secondary radiation and particle beams (X-rays, electrons, protons, ions) that enable research in a broad range of applications in molecular, biomedical and materials science, as well as in fundamental studies of laser-plasma interaction and high energy density physics.

The objective of ELI Beamlines laser systems is to provide the following main features:

• High power laser pulses with high repetition rates driving secondary sources of X-rays and accelerated particles with high user versatility, for projects featuring fundamental and applied research

• Ultra-high peak power of 10 PW (petawatt) providing focused intensities up to 10^24W/cm2, for fundamental research in high-field and high energy density physics.

Laser Parameters	ASTRELLA	L1 laser	L2 laser	L4 laser
Source type		Solid state laser
Laser type	Ti:Sapphire Laser	LBO based OPCPA with Ti:sapphire oscillator		Flashlamp-pumped Nd-glass laser
Photon energy range / wavelength range		750 - 920 [nm]
Peak Photon energy / central wavelenght	800 [nm]	825 [nm]		1060 [nm]
Fluctuations of the peak photon energy/central wavelenght	<0.1 % RMS
Spectral Bandwidth FWHM	30 [nm]	150 [nm]		13 [nm]
Beam shape	Gaussian	Gaussian	Other...	Other...
Other beam shape				Rectangular SuperGaussian
Pulse duration FWHM	35 [fs]	15 [fs]		150 [fs]
Polarisation	Linear Horizontal	Linear Horizontal		Linear Vertical
Other polarisation		Linear polarization; 100:1 (Note: S-polarization on last mirror of L1 injector – polarization at target determined by the beam transport)
Pulse repetition rate	1000 [Hz]	1000 [Hz]		0.017 [Hz]
Maximum pulse energy	6.5 [mJ]	100 [mJ]		1500 [J]
Pulse energy fluctuations		2 [sigma]
Peak power	1.86 * 10¹¹ [W]	6.6 * 10¹² [W]		10 * 10¹⁵ [W]
Peak fluence on target	82.8 [J/cm2]	0.033 [J/cm2]
Average fluence on target	6.8 [mJ/cm2]
Contrast		1 * 10^-8 [ps]
Peak intensity on target	4.7 * 10¹⁵ [W/cm2]
Beam diameter	11 [mm]	27.5 [mm]		598 [mm]
Note	1) Contrast: (1000:1 ; prepulse) & (100:1 ; postpulse) 2) Peak intensity on target : 4.7 PW/cm2 (estimated for minimal 10 um focal spot size) 3) Pointing stability: < 10 urad (RMS). The value of the Peak fluence on target is estimated for minimal 10 um focal spot size. 4) Not tunable. 5) Pulse energy fluctuations sigma: < 0,16% RMS. 6) Beam diameter (at the exit from the source): 11mm (1/e^2).	The maximum pulse energy will be > 100 mJ from 2020. During 2019 the laser will operate at reduced energy of 20 mJ.	The laser is to be completed by 2022 so there is no L2 beam available for users or experiments now.	The data for the L4 laser are shown in the document "L4-parameters". The minimum spectral bandwidth at FWHM is 13 nm. The specified polarisation is on the output of the compressor, and the polarisation at target is determined by the beam transport. Radius at 1/e^2 intensity should be 29.9 cm and the diameter 59.8 cm.