Sun Fei, Cao Zhaoliang, Wang Yukun, Zhang Caihua, Zhang Xingyun, Liu Yong, Mu Quanquan, Xuan Li
Opt Express. 2016 Nov 28;24(24):27494-27508. doi: 10.1364/OE.24.027494.
Almost all the deformable mirror (DM) based adaptive optics systems (AOSs) used on large aperture telescopes work at the infrared waveband due to the limitation of the number of actuators. To extend the imaging waveband to the visible, we propose a DM and Liquid crystal wavefront corrector (DM/LCWFC) combination AOS. The LCWFC is used to correct the high frequency aberration corresponding to the visible waveband and the aberrations of the infrared are corrected by the DM. The calculated results show that, to a 10 m telescope, DM/LCWFC AOS which contains a 1538 actuators DM and a 404 × 404 pixels LCWFC is equivalent to a DM based AOS with 4057 actuators. It indicates that the DM/LCWFC AOS is possible to work from visible to infrared for larger aperture telescopes. The simulations and laboratory experiment are performed for a 2 m telescope. The experimental results show that, after correction, near diffraction limited resolution USAF target images are obtained at the wavebands of 0.7-0.9 μm, 0.9-1.5 μm and 1.5-1.7 μm respectively. Therefore, the DM/LCWFC AOS may be used to extend imaging waveband of larger aperture telescope to the visible. It is very appropriate for the observation of spatial objects and the scientific research in astronomy.
由于致动器数量的限制，几乎所有用于大口径望远镜的基于变形镜（DM）的自适应光学系统（AOS）都工作在红外波段。为了将成像波段扩展到可见光，我们提出了一种变形镜与液晶波前校正器（DM/LCWFC）组合的自适应光学系统。液晶波前校正器用于校正对应于可见光波段的高频像差，而红外波段的像差则由变形镜校正。计算结果表明，对于一台10米望远镜，包含一个1538个致动器的变形镜和一个404×404像素液晶波前校正器的DM/LCWFC自适应光学系统相当于一个具有4057个致动器的基于变形镜的自适应光学系统。这表明DM/LCWFC自适应光学系统有可能用于更大口径望远镜从可见光到红外光的工作。针对一台2米望远镜进行了模拟和实验室实验。实验结果表明，校正后，分别在0.7 - 0.9微米、0.9 - 1.5微米和1.5 - 1.7微米波段获得了接近衍射极限分辨率的美国空军靶标图像。因此，DM/LCWFC自适应光学系统可用于将更大口径望远镜的成像波段扩展到可见光。这非常适合对空间物体的观测和天文学科研。
