Metrology of mirrors for the National Ignition Facility

Stolz, Christopher J.; Runkel, Michael J.; McBurney, Michael S.; Cheek, Robert E.; Menapace, Joseph A.

doi:10.1117/12.538472

Cited by 10 publications

(2 citation statements)

References 17 publications

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“…Detailed descriptions of NIF's laser architecture and the performance of the laser system have been presented recently [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The NIF laser system is shown in figure 1.…”

Section: The Nif Laser System Architecturementioning

confidence: 99%

The National Ignition Facility: enabling fusion ignition for the 21st century

Miller¹,

Moses²,

Wüest³

2004

Nucl. Fusion

333

148

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The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, when completed in 2008, will contain a 192-beam, 1.8-Megajoule, 500-Terawatt, ultraviolet laser system together with a 10-meter-diameter target chamber and room for 100 diagnostics. NIF is housed in a 26,000 square meter environmentally controlled building and is the world's largest and most energetic laser experimental system. NIF provides a scientific center for the study of inertial confinement fusion and the physics of matter at extreme energy densities and pressures. NIF's energetic laser beams will compress fusion targets to conditions required for thermonuclear burn, liberating more energy than required to initiate the fusion reactions. Other NIF experiments will study physical processes at temperatures approaching 10 8 K and 10 11 bar; conditions that exist naturally only in the interior of stars and planets. NIF is currently configured with four laser beams activated in late 2002. These beams are being regularly used for laser performance and physics experiments and to date nearly 250 system shots have been conducted. NIF's laser beams have generated 106 kilojoules in 23-ns pulses of infrared light and over 16 kJ in 3.5-ns pulses at the third harmonic (351 nm). A number of target experimental systems are being commissioned in support of experimental campaigns. This paper provides a detailed look the NIF laser systems, laser and optical performance, and results from laser commissioning shots. We also discuss NIF's high-energy density and inertial fusion experimental capabilities, the first experiments on NIF, and plans for future capabilities of this unique facility.

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Section: The Nif Laser System Architecturementioning

confidence: 99%

The National Ignition Facility: enabling fusion ignition for the 21st century

Miller¹,

Moses²,

Wüest³

2004

Nucl. Fusion

333

148

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“…Under the subsequent laser irradiation, the size of the damage point may increase rapidly [ 5 , 6 ]. According to the standard of NIF, when the shading area of the damaged point accounts for more than 3% of the surface, it is considered that the service life of the optics is exhausted and they need to be replaced as soon as possible [ 7 ]. At the same time, the existence of laser-induced damage will affect the beam transmission quality, and even cause damage to downstream components.…”

Section: Introductionmentioning

confidence: 99%

Study on the Repair Technology of Laser Damage-Fused Silica Optics Based on the Neural Network Method

et al. 2022

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As a key component of a high-power laser device, fused silica optics needs to bear great laser energy, and laser damage is easily generated on the optical surface. In order to improve the service life and availability of optics, it is necessary to repair the damaged optics. In this work, the repair technique of damaged, fused silica optics was studied. The neural network method was mainly used to establish the correlation between the number of small-scale damage points and the repair depth. The prediction accuracy of the model is better than 90%. Based on the neural network model, the removal depth parameters were optimized with the suppression coefficient of the damage points. The processing effect of the optimized parameters was verified by magnetorheological polishing experiments. In this paper, a repair technique based on a neural network was proposed, which avoids the low efficiency caused by processing iterations in the repair process, and can accurately what was expected. The method proposed in this work has an important reference value in the repair process of fused silica optics.

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