Accurate target-plane focal-spot characterization in high-energy laser systems using phase retrieval

Kruschwitz, B. E.; Bahk, S. -W.; Bromage, J.; Moore, M. D.; Irwin, D.

doi:10.1364/oe.20.020874

Accurate target-plane focal-spot characterization in high-energy laser systems using phase retrieval

Journal Article · Tue Aug 28 04:00:00 EDT 2012 · Optics Express

DOI:https://doi.org/10.1364/oe.20.020874· OSTI ID:1053256

Kruschwitz, B. E. ^[1]; Bahk, S. -W.; Bromage, J.; Moore, M. D.; Irwin, D.

Laboratory for Laser Energetics, University of Rochester, Rochester, NY

Target-plane intensities on the short-pulse beamlines of OMEGA EP, a petawatt-class laser, are characterized on-shot using the focal-spot diagnostic (FSD), an indirect wavefront-based measurement. Phaseretrieval methods are employed using on-shot and offline camera-based farfield measurements to improve the wavefront measurements and yield more-accurate, repeatable focal-spot predictions. Incorporation of these techniques has improved the mean cross-correlation between the FSD predictions and direct far-field fluence measurements in the target chamber from 0.78 to 0.94.

Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE

DOE Contract Number:: FC52-08NA28302

OSTI ID:: 1053256

Report Number(s):: DOE/NA/28302-1083; 2012-59; 2059

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 19 Vol. 20; ISSN 1094-4087

Publisher:: Optical Society of America (OSA)

Country of Publication:: United States

Language:: English

References (9)

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