Scattering-induced downstream beam modulation by plasma scalded mirrors

J. R. Schmidt; M. J. Runkel; K. E. Martin; C. J. Stolz

doi:10.1117/12.748446

20 December 2007 Scattering-induced downstream beam modulation by plasma scalded mirrors

J. R. Schmidt, M. J. Runkel, K. E. Martin, C. J. Stolz

Author Affiliations +

Proceedings Volume 6720, Laser-Induced Damage in Optical Materials: 2007; 67201H (2007) https://doi.org/10.1117/12.748446
Event: Boulder Damage Symposium XXXIX: Annual Symposium on Optical Materials for High Power Lasers, 2007, Boulder, Colorado, United States

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%.

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J. R. Schmidt, M. J. Runkel, K. E. Martin, and C. J. Stolz "Scattering-induced downstream beam modulation by plasma scalded mirrors", Proc. SPIE 6720, Laser-Induced Damage in Optical Materials: 2007, 67201H (20 December 2007); https://doi.org/10.1117/12.748446

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