Continuous phase plate simulation based on slope removal model

Qing Gao; Shanshan Wang; Nansheng Zhang; Qun Hao; Feng Shi

doi:10.1117/12.2691412

6 November 2023 Continuous phase plate simulation based on slope removal model

Qing Gao, Shanshan Wang, Nansheng Zhang, Qun Hao, Feng Shi

Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 1292131 (2023) https://doi.org/10.1117/12.2691412
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia

Abstract

Inertial Confinement Fusion (ICF) is a promising controlled fusion technology. In order to suppress the distortion generated during the laser transmission process of ICF, beam smoothing technology is crucial. Continuous Phase Plate (CPP) has attracted widespread attention due to its high energy utilization efficiency, as well as its easy-to-control focal spot shape. However, CPP is a complex freeform surface structure with multiple cycles and large gradients, and its modulation performance is closely related to the surface slope. Therefore, a simulation processing method based on slope removal model for CPP is proposed. A slope removal model is constructed, removal strategies are formulated, and a gradient threshold for dwell time is set to ensure continuous and smooth motion of the machine tool. The slope removal model is used for simulation processing, and the residual between the slope surface shape of CPP and the standard slope surface shape can be converged from an initial RMS of 4.32 μrad to 0.337 μrad. In order to further verify the accuracy of the model, the inverse gradient algorithm is used to restore the slope to the height. Compared with the designed standard height surface, the RMS value of the height residual converges from 0.209 μm to 0.130 μm. Based on the characteristics of the machine tool, an analysis and exploration is carried out, and a gradient threshold for adjacent dwell time is set. The result shows that the slope model can achieve initial simulation processing of CPP.

Citation Download Citation

Qing Gao, Shanshan Wang, Nansheng Zhang, Qun Hao, and Feng Shi "Continuous phase plate simulation based on slope removal model", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 1292131 (6 November 2023); https://doi.org/10.1117/12.2691412

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KEYWORDS

Photovoltaics

Shape analysis

Error analysis

Design and modelling

Optical components

Reflection

Systems modeling

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