Experiment system of thin-mirror active optics

Ding-qiang Su; Sheng-tao Jiang; WeiYao Zou; Shi-mo Yang; ShuYing Yang; Haiying Zhang; Qi-chao Zhu

doi:10.1117/12.176229

1 June 1994 Experiment system of thin-mirror active optics

Ding-qiang Su, Sheng-tao Jiang, WeiYao Zou, Shi-mo Yang, ShuYing Yang, Haiying Zhang, Qi-chao Zhu

Proceedings Volume 2199, Advanced Technology Optical Telescopes V; (1994) https://doi.org/10.1117/12.176229
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

Abstract

In this system, the experiment mirror has 500 mm aperture and 6 mm thickness. There are 58 actuators and three fixed points in it. A Shack-Hartmann test apparatus is used for the measurement of wavefront aberration. In this apparatus an ingenious equivalent of lenslet array is used. All image points formed by it appear very clear theoretical diffraction pattern. And a CCD from a TV camera is used. Like European Southern Observatory, we use quasi-Zernike polynomial to fit the wavefront aberration for correcting. But in our work correction is to the whole wavefront aberration (except lateral focus and longitudinal focus). In our work, another important character is that the damp least square method is used for determining the forces. The correction results are the root mean square of wavefront aberration about 0.02 - 0.04 micrometers . A circle including measuring and correcting the wavefront aberration takes about 3.3 minutes. A more precise algorithm proposed by us is used for calculating the wavefront aberration for checking.

Citation Download Citation

Ding-qiang Su, Sheng-tao Jiang, WeiYao Zou, Shi-mo Yang, ShuYing Yang, Haiying Zhang, and Qi-chao Zhu "Experiment system of thin-mirror active optics", Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); https://doi.org/10.1117/12.176229

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