Mr. Dilong Wu Profile

Dilong Wu

at Fine Optical Engineering Research Ctr

SPIE Involvement:

Author

Publications (7)

Proceedings Article | 29 December 2023 Paper

Focal length measurement of large aperture lenses using CGH

Jian-Peng Cui, Zhi-Gang Li, Heng Zhao, Ning Zhang, Zhen-Jun Bao, Di-Long Wu, Hua Xu

Proceedings Volume 12976, 129761T (2023) https://doi.org/10.1117/12.3009495

KEYWORDS: Computer generated holography, Lenses, Error analysis, Distance measurement, Wavefronts, Fizeau interferometers, Spatial filtering, Interferometers, Diffraction, Confocal microscopy

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Proceedings Article | 29 December 2023 Paper

Research on stable convergence technology of transmitted wavefront mid-spatial-frequency errors of large square spherical lens

Zhigang Li, Jinyong Huang, Jianpeng Cui, Zhenjun Bao, Heng Zhu, Dilong Wu, Hongmei Cai

Proceedings Volume 12976, 129761N (2023) https://doi.org/10.1117/12.3009460

KEYWORDS: Polishing, Wavefront errors, Spherical lenses, Wavefronts, Spatial frequencies, Optics manufacturing, Spatial filtering

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The transmitted wavefront mid-spatial-frequency(MSF) errors of spherical lens has a great influence on the quality of the transmitted beam. Aiming at the problems of poor convergence precision and low convergence efficiency in mid-spatial frequency errors polishing of large square spherical lenses, this paper proposes a mid-spatial-frequency errors correction technology by using full-aperture rigid polishing combined with numerically controlled sub-aperture smooth polishing. In the full-aperture polishing stage, the surface shape distribution that is conducive to subsequent sub-aperture polishing is obtained through radius compensation technology to reduce the sudden change of surface shape in the corner area of the component. The more rigid polishing pad is used to smooth the whole surface then, so that the component has better MSF errors condition before the sub-aperture high-precision surface correction. In the stage of small tool CNC polishing, the transmission structure and mass distribution of the polishing disc are optimized, and the ideal transmission characteristics and size parameters of the polishing disc are obtained through mechanical simulation analysis to reduce the overturning moment of the polishing disc when the direction changes suddenly. This optimization also improves the pressure distribution of the polishing interface. Stability, a flexible polishing disc combined with a high dispersion polishing slurry is used to correct the surface errors. The concentration of the polishing slurry is optimized and the supply method is well changed. So when the surface shape errors convergence process is more efficient and controllable, it will not cause the deterioration of the MSF errors. The smooth tool is applied in the last stage with reducing the temperature change of the polishing interface. All these measures are aimed to increase the stability of smooth polishing and to achieve high-efficiency, high-precision and stable convergence of MSF errors. The experimental verification was carried out on four square spherical lenses with a size of 440mm×440mm. The final PSD1:RMS values have all reached within 1.8nm. Additionally the overall processing time has been greatly shortened.

Proceedings Article | 27 November 2023 Paper

Mid-spatial frequency error measurement of large aperture lenses

Jian-Peng Cui, Zhi-Gang Li, Heng Zhao, Ning Zhang, Zhen-Jun Bao, Di-Long Wu, Hua Xu

Proceedings Volume 12769, 127690L (2023) https://doi.org/10.1117/12.2687466

KEYWORDS: Lenses, Wavefront errors, Laser frequency, Computer generated holography, Wavefronts, Laser systems engineering, Error analysis, Diffraction, Wave propagation, Spectral models

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Proceedings Article | 27 October 2021 Paper

Radius measurement of large aperture long-focal-length lens using computer-generated hologram

Jian-Peng Cui, Zhi-Gang Li, Zhen-Jun Bao, Heng Zhao, Ning Zhang, Jie Liu, Di-Long Wu, Hua Xu, Ping Ma

Proceedings Volume 11927, 119270E (2021) https://doi.org/10.1117/12.2616261

KEYWORDS: Computer generated holography, Interferometers, Wavefronts, Optical spheres, Confocal microscopy, Distance measurement, Optical alignment, Error analysis, Spherical lenses, Spatial filters

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