Simultaneous Diagnosis of Refractive Index and Roughness of Ice Layer in Laser Fusion Targets

Zhaorui Xu; Dong Liu; Shaojing Peng; Xinming Li; Tianliang Yan; Jian Bai; Yibing Shen; Lan Wu; Chong Liu

doi:10.3788/AOS240788

Acta Optica Sinica, Volume. 44, Issue 16, 1612002(2024)

Simultaneous Diagnosis of Refractive Index and Roughness of Ice Layer in Laser Fusion Targets

Zhaorui Xu, Dong Liu^*, Shaojing Peng, Xinming Li, Tianliang Yan, Jian Bai, Yibing Shen, Lan Wu, and Chong Liu

State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China

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Figures & Tables(15)

Fig. 1. Typical plastic-coated target

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Fig. 2. Schematic diagram of the galvanometer scanning synchronous diagnosis system

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Fig. 3. Roughness diagnosis process of the ice layer

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Fig. 4. Arithmetic mean roughness of the ice layer

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$3D refractive index reconstruction process of the ice layer$

Fig. 5. 3D refractive index reconstruction process of the ice layer

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$3D refractive index simulation reconstruction of the target shell. (a) 3D reconstruction results; (b) the chromatographic result of a particular layer$

Fig. 6. 3D refractive index simulation reconstruction of the target shell. (a) 3D reconstruction results; (b) the chromatographic result of a particular layer

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$3D refractive index simulation reconstruction of the target ice layer. (a) 3D reconstruction results; (b) the chromatographic result of a particular layer$

Fig. 7. 3D refractive index simulation reconstruction of the target ice layer. (a) 3D reconstruction results; (b) the chromatographic result of a particular layer

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Fig. 8. Roughness diagnosis. (a) Ice backlit shadowgraph; (b) after pretreatment; (c) after the edge fitting

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$Results of the ice layer roughness diagnosis. (a) Ice layer thickness before and after refractive index correction; (b) PSD of the ice layer$

Fig. 9. Results of the ice layer roughness diagnosis. (a) Ice layer thickness before and after refractive index correction; (b) PSD of the ice layer

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Fig. 10. Four-step phase-shifting interferograms. (a) 0°; (b) 90°; (c) 180°; (d) 270°

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$Results of wavefront measurement and 2D refractive index inversion. (a) Wavefront measurement results; (b) inversion results of target 1; (c) inversion results of target 2$

Fig. 11. Results of wavefront measurement and 2D refractive index inversion. (a) Wavefront measurement results; (b) inversion results of target 1; (c) inversion results of target 2

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Table 1. Parameters of four targets for simulation
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Table 1. Parameters of four targets for simulation
Target No. Outer radius /μm t₁ /μm t₂ /μm n₁ n₂
1 383 25 65 1.56 1.16
2 450 3 100 1.59 1.13
3 1000 50 150 1.50 1.14
4 2000 100 300 1.50 1.14

Table 2. 3D refractive index reconstruction results of the target shell
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Table 2. 3D refractive index reconstruction results of the target shell
Single-layer target No. PV /% Mean error /% RMS /% Time /s
1 0.61 0.11 0.14 80
2 0.97 0.14 0.19 86
3 1.17 0.11 0.15 82
4 1.17 0.11 0.15 81

Table 3. 3D refractive index reconstruction results of the target ice layer
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Table 3. 3D refractive index reconstruction results of the target ice layer
Double-layer target No. PV /% Mean error /% RMS /% Time /s
1 2.88 0.15 0.21 55
2 0.90 0.11 0.14 58
3 0.91 0.16 0.21 61
4 0.71 0.10 0.13 67

Table 4. Refractive index measurement results of two monolayer target samples
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Table 4. Refractive index measurement results of two monolayer target samples
Target No.
Wavelength /
nm
${\bar{n}}_{1}$ $P_{V_{r e}}$ /10^-3 $R_{M S_{r e}}$ /10^-4 $δ n_{1}$ /%
1 532 1.5668 2.62 5.17 1.12
2 532 1.5492 1.55 2.90 -0.02

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Zhaorui Xu, Dong Liu, Shaojing Peng, Xinming Li, Tianliang Yan, Jian Bai, Yibing Shen, Lan Wu, Chong Liu. Simultaneous Diagnosis of Refractive Index and Roughness of Ice Layer in Laser Fusion Targets[J]. Acta Optica Sinica, 2024, 44(16): 1612002

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