Electra: durable repetitively pulsed 700 J, 100-ns electron-beam pumped KrF laser system

Matthew F. Wolford; Matthew C. Myers; John L. Giuliani; John D. Sethian; Patrick M. Burns; Frank Hegeler; Reginald Jaynes

doi:10.1117/12.698973

14 February 2007 Electra: durable repetitively pulsed 700 J, 100 ns electron beam pumped KrF laser system

Matthew F. Wolford, Matthew C. Myers, John L. Giuliani, John D. Sethian, Patrick M. Burns, Frank Hegeler, Reginald Jaynes

Author Affiliations +

Proceedings Volume 6454, High Energy/Average Power Lasers and Intense Beam Applications; 645407 (2007) https://doi.org/10.1117/12.698973
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

Abstract

Electra is a repetitively pulsed, electron beam pumped Krypton Fluoride (KrF) laser at the Naval Research Laboratory that is developing the technologies that can meet the Inertial Fusion Energy (IFE) requirements for durability, efficiency, and cost. Electra in oscillator mode has demonstrated single shot and rep-rate laser energies exceeding 700 J with 100 ns pulsewidth at 248 nm. Continuous operation of the KrF laser has lasted for more than 2.5 hours without failure at 1 Hz and 2.5 Hz. The measured intensity and energy per shot is reproducible in rep-rate runs of 1 Hz, 2.5 Hz and 5 Hz for greater than thousand shot durations. The KrF intrinsic efficiency is predicted to be 12% with measurements and modeling (Orestes Code). In addition we have compared Orestes with initial results of 23 J for the Electra Pre-Amplifier. The positive agreement between Orestes and our results lead allow us to predict that large KrF laser systems will meet the efficiency requirements for inertial fusion energy driver. The focal profile measurements show for single shot conditions recovery in less than 200 ms, the time needed for 5 Hz operation. Rep-rate focal profile measurements at 1 Hz show reproducibility in spatial extent and energy.

Citation Download Citation

Matthew F. Wolford, Matthew C. Myers, John L. Giuliani, John D. Sethian, Patrick M. Burns, Frank Hegeler, and Reginald Jaynes "Electra: durable repetitively pulsed 700 J, 100 ns electron beam pumped KrF laser system", Proc. SPIE 6454, High Energy/Average Power Lasers and Intense Beam Applications, 645407 (14 February 2007); https://doi.org/10.1117/12.698973

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