1. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China 2. Key Laboratory of Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China 3. University of Chinese Academy of Sciences, Beijing 100049, China 4. School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China
Abstract:To study the thermodynamics properties of the solar atmosphere with different height distribution, the imaging grating spectrometer with excellent image quality is one of the important tools to achieve this goal. However, the atmosphere turbulence can not be avoided for the imaging grating spectrometer installed in the ground-based solar telescope, and the imaging properties of the grating spectrometer will influenced by the wavefront aberration generalized by the atmosphere turbulence and the wavefront aberration generalized by the optical system adjusting errors and the optical element manufacturing errors. The atmospheric turbulence can be effectively compensated by the Adaptive Optics. To correct the wavefront aberrations of the optical system, a correction method based on Adaptive Optics is proposed, and the experiment validation is carried out to verify the feasibility of the method. The results demonstrate that the correction method proposed can effectively correct the wavefront aberration generalized by the atmosphere turbulence and the optical system aberration. The RMS value is roughly equal to 0.025λ after the Adaptive Optics correction. Besides, it has the virtue of lower the requirement of optical system adjusting errors and optical elements manufacturing errors.
[1] Volkmer R, von der Lühe O, Denker C, et al. Astronomische Nachrichten, 2010, 331(6): 624. [2] Thomas R. Rimmele. Proc. SPIE, 2004, 34. [3] van Noort M J,Rouppe van der Voort L H M. Astrophysical Journal, 2006, 648: L67. [4] Chae J, Park H, Ahn K, et al. Solar Physics, 2012. [5] Rao C, Zhu L, Gu N, et al. Applied Optics, 2010, 49(31), G129. [6] Rao C, Zhu L, Gu N, et al. Third AO4ELT Conference-Adaptive Optics for Extremely Large Telescopes, 2013. [7] XUE Qing-sheng(薛庆生). 2010 Ph. D. Dissertation (2010 博士学位论文). Beijing: University of Chinese Academy of Sciences(中国科学院大学),2010. [8] Palmer C A, Loewen E G. Diffraction Grating Handbook,Springfield, OH: Newport Corporation,2005. [9] HUANG You-ran, XU Ao-ao, QING Zhi-hai, et al(黄佑然,许熬敖,秦志海, 等). Astrophysics Experiment(实测天体物理学). Beijing: Science Press(科学出版社), 1987. 267. [10] Roddier R. Progress in Optics, 1981. 281. [11] Goodman J W. Statistical Optics. New York:Wiley-Interscience, 1985. 567. [12] Rao C, Jiang W, Ling N. Proc. SPIE, 1999, 3763:84.