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

doi:10.1117/12.3009495

29 December 2023 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, Eighth Asia Pacific Conference on Optics Manufacture and Third International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2023); 129761T (2023) https://doi.org/10.1117/12.3009495
Event: 8th Asia Pacific Conference on Optics Manufacture & 3rd International Forum of Young Scientists on Advanced Optical Manufacturing, 2023, Shenzhen, China

Abstract

In this paper, we present a method for measuring the focal length of large aperture lenses using reflective computergenerated hologram (CGH). The CGH is designed to emulate the properties of a large aperture retrosphere through diffraction when performing null test of a lens with an interferometer. To validate this test approach, we designed and fabricated a 450 mm × 450 mm reflective CGH specifically for testing the 440 mm × 440 mm spatial filter lenses with a focal length of 31984.222 mm (@ 632.8 nm). Experiments and error analysis were carried out. The results show that the CGH test approach features high accuracy and good repeatability.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jian-Peng Cui, Zhi-Gang Li, Heng Zhao, Ning Zhang, Zhen-Jun Bao, Di-Long Wu, and Hua Xu "Focal length measurement of large aperture lenses using CGH", Proc. SPIE 12976, Eighth Asia Pacific Conference on Optics Manufacture and Third International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2023), 129761T (29 December 2023); https://doi.org/10.1117/12.3009495

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