The 10 Hz repetition rate HF-2PW laser of ELI ALPS, which was designed to operate at 300 W average power, is being commissioned during the first ramping up phase. The system is currently running at the 10 J energy level and full energy compression was demonstrated for >2 hours of continuous operation with a pulse duration of 23 fs. Day-to-day operation represents an important milestone among next generation high peak and average power laser systems. During this period, fine tuning of pulse parameters, investigation of stability and reliability of the system is performed. Valuable experiences during operation are discussed in this paper.
Laser-induced damage mechanisms were investigated for an ultra-broadband chirped mirror, as part of a systematic
study of few-cycle pulse laser-induced damage threshold (LIDT) of widely-used ultra-broadband optics,
in vacuum and in air, for single and multi-pulse regimes (S-on-1). Microscopic analysis of damage morphology
suggests that three different damage mechanisms occur across the fluence range 0.15-0.4J/cm2, while no ablation
was yet observed. The three regimes resulted in shallow swelling (< 10 nm tall), tall blistering (~ 150 nm
tall), and annular blistering (damage suppressed at highest intensity, forming a ring shape). Descriptions of the
potential mechanisms are discussed.
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