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Proceedings Paper

Scattering-induced downstream beam modulation by plasma scalded mirrors
Author(s): J. R. Schmidt; M. J. Runkel; K. E. Martin; C. J. Stolz
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Paper Abstract

Previous work concluded that plasma scalds on laser-conditioned multilayer dielectric mirror coatings are a stable, benign damage morphology. Recent large-aperture measurements indicate that plasma scalds may lead to fratricide of down-stream optics by increasing beam contrast. This paper describes the results of measurements performed to examine the effect of quasi-periodic plasma scalds covering the entire clear aperture on downstream beam modulation. A collimated, linearly-polarized 1053-nm beamline was constructed that irradiated approximately 5 cm2 of the plasma scalded region. This beam was propagated ~8 meters and sampled with a 10-bit, megapixel CCD camera and analyzed for contrast (peak/average intensity). A lineout across the sample was built up by translating the optic across the beam. The contrast results were compared to a baseline wedged flat with surface figure of λ/100 and a contrast adder for the plasma scalds calculated. This was defined by. In all, optics with average plasma scald fractions of 0.9, 2.3, 4 and 14% were measured. Preliminary results indicate that plasma scald fractions of 4% and below contribute a contrast adder of less than 2.5%.

Paper Details

Date Published: 20 December 2007
PDF: 10 pages
Proc. SPIE 6720, Laser-Induced Damage in Optical Materials: 2007, 67201H (20 December 2007); doi: 10.1117/12.748446
Show Author Affiliations
J. R. Schmidt, Lawrence Livermore National Lab. (United States)
M. J. Runkel, Lawrence Livermore National Lab. (United States)
K. E. Martin, Lawrence Livermore National Lab. (United States)
C. J. Stolz, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 6720:
Laser-Induced Damage in Optical Materials: 2007
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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