Laser-induced damage is still the key issue to restrict the development of high power laser system for inertial confinement fusion (ICF). Based on a high power laser prototype, laser-induced damage behaviors and performance of large aperture final optics were experimentally studied. And, the damage inducement and morphology were comprehensively analyzed. Probability density functions (PDF) for laser fluence of near field with different resolution were obtained to analyze the influence of optical field distribution on the optical damage. High fluence of the near field was revealed in PDF with higher resolution, and the missing strong modulation fractions in the measured near field was most probably damage the optical elements. The surface damage morphology was observed and the main damage mechanism was discussed. Several kinds of surface damage morphologies with individual characteristics were sorted. The ratio of width and depth and the main contributors of laser damage were discussed.
3ω laser damage of fused silica optics is the bottleneck of high power laser systems for ICF. Excellent beam quality plays an important role in improving the anti-damage capability of final optics system. We have developed a new optical field measurement technology based on computational optical imaging. With the high power laser prototype of SGII-UP facility, damage resistance of final optics was experimentally studied. The near filed of laser beam was measured with a high resolution to study the effects of modulation and propagation on laser damage. The near field improvement of high power laser beam are reported and the influence of near filed quality on damage performance of final optics are discussed. The development of the defect detection techniques of final optics are introduced. Finally, we present the development perspective of final optics system for ICF laser driver. At present, the damage resistance capability of final optics assembly is 6J/cm2 at normal operation, we will continue to improve the ability in the next step of work.
UV laser damage is still the key issue of high power nanosecond laser systems. The operation performance of the final optics in SGII-UP facility is first reviewed. Based on a high power laser prototype, laser-induced damage of large aperture final optics at 351nm was experimentally studied, including damage initiation, growth and morphologies. The near filed of 351nm laser beam was precisely measured with a high resolution by using the precision diagnostics system (PDS) to study the effects of laser modulation and propagation on laser damage. The damage behaviors were comprehensively analyzed and the main contributors to laser damage were discussed. The development perspective of final optics system for high power laser system is briefly introduced.
The latest progress on high power laser facilities in NLHPLP was reported. Based on a high power laser prototype, damage behavior of 3ω optics was experimentally tested, and the key influencing factors contributed to laser-induced damage in optics were deeply analyzed. The latest experimental results of advanced precision measurement for optical quality applied in the high power laser facility were introduced. At last, based on the accumulated works of 3ω elements damage behavior status in our laboratory, beam expanding scheme was presented to increase the total maximum output 3ω energy properly and decrease the laser induced damage risking of ω optics simultaneously.
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