State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese academy of Sciences, Changchun, Jilin, 130033, China.
Graduate School of the Chinese Academy of Sciences, Beijing, 100039, China.
Sci Rep. 2017 Aug 30;7(1):10034. doi: 10.1038/s41598-017-09595-2.
There are more than eight large aperture telescopes (larger than eight meters) equipped with adaptive optics system in the world until now. Due to the limitations such as the difficulties of increasing actuator number of deformable mirror, most of them work in the infrared waveband. A novel two-step high-resolution optical imaging approach is proposed by applying phase diversity (PD) technique to the open-loop liquid crystal adaptive optics system (LC AOS) for visible light high-resolution adaptive imaging. Considering the traditional PD is not suitable for LC AOS, the novel PD strategy is proposed which can reduce the wavefront estimating error caused by non-modulated light generated by liquid crystal spatial light modulator (LC SLM) and make the residual distortions after open-loop correction to be smaller. Moreover, the LC SLM can introduce any aberration which realizes the free selection of phase diversity. The estimating errors are greatly reduced in both simulations and experiments. The resolution of the reconstructed image is greatly improved on both subjective visual effect and the highest discernible space resolution. Such technique can be widely used in large aperture telescopes for astronomical observations such as terrestrial planets, quasars and also can be used in other applications related to wavefront correction.
截至目前，全球已有超过 8 台大口径望远镜（口径大于 8 米）配备了自适应光学系统。由于增加变形镜驱动器数量的困难等限制，大多数望远镜都工作在红外波段。为了实现可见光高分辨率自适应成像，我们提出了一种新颖的两步高分辨率光学成像方法，即将相位差（PD）技术应用于开环液晶自适应光学系统（LC AOS）。考虑到传统的 PD 技术不适用于 LC AOS，我们提出了一种新的 PD 策略，该策略可以减小由液晶空间光调制器（LC SLM）产生的非调制光引起的波前估计误差，并使开环校正后的残余变形更小。此外，LC SLM 可以引入任何像差，从而实现相位差的自由选择。在模拟和实验中，估计误差都大大降低。在主观视觉效果和最高可分辨空间分辨率上，重建图像的分辨率都得到了极大的提高。该技术可广泛应用于大口径望远镜进行天文观测，如类地行星、类星体，也可应用于与波前校正相关的其他应用。
