Eli Beamlines’ L4 Aton Laser hits 5 petawatts output
Operating safely at this energy level is key for scaling up and for scientific experiments. ELI Beamlines Facility focuses on high-energy, high-repetition rate systems.
During a test program in September 2025, the flagship L4 ATON system demonstrated a laser performance of 786 J energy compressed to 154 fs, corresponding to a peak power of 5.1 PW.
This currently represents the highest pulse energy achieved worldwide at the multi-petawatt power level.
“This accomplishment is about more than figures,” said Allen Weeks, Director General of ELI ERIC. “It demonstrates the maturity of ELI’s technology and establishing ELI as a world-leading facility that enables scientists to carry out groundbreaking experiments in high-intensity laser research.”
L4 ATON an international effort
The L4 ATON laser system was developed by a consortium of international partners made up of National Energetics (USA), EKSPLA (Lithuania) and the ELI Beamlines Facility team.
Author's summary: ELI Beamlines' L4 ATON laser reaches 5 petawatts output.
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