TY - GEN
T1 - Continuous phase plate simulation based on slope removal model
AU - Qing, Gao
AU - Shanshan, Wang
AU - Nansheng, Zhang
AU - Qun, Hao
AU - Feng, Shi
N1 - Publisher Copyright:
© 2023 SPIE.
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
KW - Continuous phase plate
KW - optical high precision machining
KW - slope removal model
UR - http://www.scopus.com/inward/record.url?scp=85178319594&partnerID=8YFLogxK
U2 - 10.1117/12.2691412
DO - 10.1117/12.2691412
M3 - Conference contribution
AN - SCOPUS:85178319594
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Third International Computing Imaging Conference, CITA 2023
A2 - Shao, Xiaopeng
PB - SPIE
T2 - 3rd International Computing Imaging Conference, CITA 2023
Y2 - 1 June 2023 through 3 June 2023
ER -