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Proceedings Paper

Electra: durable repetitively pulsed 700 J, 100-ns electron-beam pumped KrF laser system
Author(s): Matthew F. Wolford; Matthew C. Myers; John L. Giuliani; John D. Sethian; Patrick M. Burns; Frank Hegeler; Reginald Jaynes
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Paper 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.

Paper Details

Date Published: 14 February 2007
PDF: 9 pages
Proc. SPIE 6454, High Energy/Average Power Lasers and Intense Beam Applications, 645407 (14 February 2007); doi: 10.1117/12.698973
Show Author Affiliations
Matthew F. Wolford, Naval Research Lab. (United States)
Matthew C. Myers, Naval Research Lab. (United States)
John L. Giuliani, Naval Research Lab. (United States)
John D. Sethian, Naval Research Lab. (United States)
Patrick M. Burns, Naval Research Lab. (United States)
Frank Hegeler, Commonwealth Technologies Inc. (United States)
Reginald Jaynes, Science Applications International Corp. (United States)

Published in SPIE Proceedings Vol. 6454:
High Energy/Average Power Lasers and Intense Beam Applications
Steven J. Davis; Michael C. Heaven; J. Thomas Schriempf, Editor(s)

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