The Asterix IV laser
(commonly referred to by the acronym PALS for Prague Asterix Laser System) is a high power photolytically pumped iodine
gas laser capable of producing ~300 to 500 picosecond long pulses of light at the fundamental line of 1.315 micrometres wavelength with a total energy of about 1 kilojoule
(or tripled to the third harmonic
at 438 nanometers
with lower pulse energies) and peak powers of around 3 terawatts. There are also two smaller auxiliary beams capable of producing 100 J pulses. PALS is open to both domestic and foreign researchers.