A developmental perspective on high power laser facility technology for ICF

The damage problem of fused silica has always been one of the bottlenecks limiting the energy output of the high-power laser system. For optical components, the ionization breakdown by laser is the main factor causing damage, especially for laser plasma shock waves, which can cause large-scale fracture damage in fused silica. In this paper, the fused silica damage experiment was induced by a nanosecond laser, and the damage morphology of fused silica in the thickness range of 0.8-5.0 mm was obtained under the action of a 1-20 pulse. The damage size of fused silica decreases as the thickness of the material increases until the thickness of the material is greater than, or equal to, 1.4 mm. On the basis of theoretical analysis of a plasma shock wave, the coupling and transmission of shock wave in fused silica were studied by finite element method, and the magnitude and direction distribution of stress were obtained. By analyzing the fracture characteristics and Raman spectra of the three damaged regions of fused silica, the structural differences of a range of damage regions are analyzed, and the relationship between the macroscopic damage of fused silica and the microstructure is explained. The research results can provide a reference for understanding the characteristics and mechanism of damage characteristics induced by laser plasma shock wave.

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Study on damage characteristics of fused silica glass induced by plasma shock wave with finite element method

Shen

Chang

Feng

et al. 2019

J. Phys. D: Appl. Phys.

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Investigation on hybrid laser ablation and its application in fused silica damage mitigation

Jiang

Hui

et al. 2023

Opt. Express

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We present and investigate a hybrid laser-based method of surface shaping for damage mitigation on fused silica surfaces. Damage sites were removed and precisely shaped into an optically-benign cone by a procedure of femtosecond laser ablation with a subsequent CO2 laser polishing process. The morphology of the cone rim was quantitatively predicted by a numerical model. Since the heat-affected zone (HAZ) of the laser polishing process was effectively confined by the optimization of ablation parameters, the dimensions of the raised rim were reduced by an order of magnitude. The intensity of the on-axis hotspot was positively related to the dimensions of the raised rim, and thus an inapparent downstream intensification was achieved by the rim reduction. Laser-induced damage threshold (LIDT) of the cone was tested to be ∼14 J/cm2 on the input surface. Therefore, the presented method is appropriate to mitigate damage and also provides a promising approach to manufacturing functional microstructures for high-power applications.

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A developmental perspective on high power laser facility technology for ICF

Cited by 2 publications

References 11 publications

Study on damage characteristics of fused silica glass induced by plasma shock wave with finite element method

Study on damage characteristics of fused silica glass induced by plasma shock wave with finite element method

Investigation on hybrid laser ablation and its application in fused silica damage mitigation

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