Eight-axis-polishing machine for 2 m off-axis aspheric optics

Hyug-Gyo Rhee; Ho-Soon Yang; Il-Kweon Moon; Hagyong Kihm; Jae-Hyub Lee; Young-sik Ghim; Yun-Woo Lee

doi:10.1117/12.2009381

16 October 2012 Eight-axis-polishing machine for 2 m off-axis aspheric optics

Hyug-Gyo Rhee, Ho-Soon Yang, Il-Kweon Moon, Hagyong Kihm, Jae-Hyub Lee, Young-sik Ghim, Yun-Woo Lee

Proceedings Volume 8416, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 84161K (2012) https://doi.org/10.1117/12.2009381
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

For the purpose of fabricating off-axis aspheric optics, we propose a 8-axis-polishing machine combined with a testing tower whose height is about 9 m. The proposed polishing machine was designed and analysed by using a well-known finite element method. The eight axes of the machine have a synchronized motion generated by a computer, and each axis was calibrated by a heterodyne laser interferometer or an optical encoder. The maximum capability of the proposed polishing machine is up to 2 m in diameter, and the maximum radius of curvature of the product (optics) is slightly over 7 m. After calibration, the maximum positioning error of the machine was less than 2 μm within a whole 2 m × 2 m area. A typical fabrication result of a φ1.5 m concave mirror was also described in this manuscript.

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Hyug-Gyo Rhee, Ho-Soon Yang, Il-Kweon Moon, Hagyong Kihm, Jae-Hyub Lee, Young-sik Ghim, and Yun-Woo Lee "Eight-axis-polishing machine for 2 m off-axis aspheric optics", Proc. SPIE 8416, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 84161K (16 October 2012); https://doi.org/10.1117/12.2009381

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KEYWORDS

Polishing equipment

Interferometers

Aspheric optics

Calibration

Mirrors

Polishing

Heterodyning

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