Restraining mid-spatial-frequency error of large-size off-axis parabolic mirrors by multi-tool NC polishing

Li Zhigang; Bao Zhenjun; Zhu Heng; Cai Hongmei; Zhou Heng

doi:10.11884/HPLPB201830.170457

Volume 30 Issue 6

Jun. 2018

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Article Navigation > High Power Laser and Particle Beams > 2018 > 30(6): 062003

Zhang Haoran, Zeng Qin, Chen Chong, et al. Testing and analysis of coupled program of MCNP and FISPACT[J]. High Power Laser and Particle Beams, 2017, 29: 036025. doi: 10.11884/HPLPB201729.160424

Citation:

Li Zhigang, Bao Zhenjun, Zhu Heng, et al. Restraining mid-spatial-frequency error of large-size off-axis parabolic mirrors by multi-tool NC polishing[J]. High Power Laser and Particle Beams, 2018, 30: 062003. doi: 10.11884/HPLPB201830.170457

Zhang Haoran, Zeng Qin, Chen Chong, et al. Testing and analysis of coupled program of MCNP and FISPACT[J]. High Power Laser and Particle Beams, 2017, 29: 036025. doi: 10.11884/HPLPB201729.160424

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Restraining mid-spatial-frequency error of large-size off-axis parabolic mirrors by multi-tool NC polishing

doi: 10.11884/HPLPB201830.170457

Fine Optical Engineering Research Center, Chengdu 610041, China

Received Date: 2017-11-13
Rev Recd Date: 2018-01-12
Publish Date: 2018-06-15

Abstract

Abstract

The mid-spatial-frequency error (MSFR) of large aperture aspherical optical elements have a direct influence on the precision of the beam diffusion function and the energy scattering of the high energy laser. To solve this problem, we put forward a kind of multi-tool NC polishing technology of computer controlled optical surfacing(CCOS) for effective suppression of MSFR. The polishing process of semi-rigid polishing tool is analyzed by finite element methods, and the polishing process is theoretically simulated based on Bridging model. The experimental results show that the MSFR of large aperture aspherical optical elements can be effectively reduced by multi-tool polishing technology. The wavefront PSD1 value of specific spatial frequency has been restrained effectively. For the two finished ϕ460 mm elements, the wavefront PSD1 value has a 70% descend down to 2.835 nm. Besides, the PV value is less than 0.16λ(632.8 nm) and the RMS value is less than 0.02λ.
- computer controlled optical surfacing,
- off-axis parabolic,
- mid-spatial-frequency errors,
- semi-rigid polishing tools,
- smooth polishing

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References

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