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Visible light high-resolution imaging system for large aperture telescope by liquid crystal adaptive optics with phase diversity technique

机译:液晶自适应光学相变技术的大口径望远镜可见光高分辨率成像系统

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摘要

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.
机译:到现在为止,世界上已有八台以上配备自适应光学系统的大口径望远镜(大于八米)。由于诸如增加可变形反射镜的致动器数量的困难之类的限制,它们中的大多数在红外波段中工作。通过将相位分集(PD)技术应用于可见光高分辨率自适应成像的开环液晶自适应光学系统(LC AOS),提出了一种新颖的两步高分辨率光学成像方法。考虑到传统的局部放电不适用于LC AOS,提出了一种新的局部放电策略,可以减少液晶空间光调制器(LC SLM)产生的非调制光引起的波前估计误差,并使开环后的残留畸变成为可能。校正要小一些。此外,LC SLM可以引入任何像差,从而可以自由选择相位分集。在仿真和实验中,估计误差都大大降低了。在主观视觉效果和最高可分辨空间分辨率上,都大大提高了重建图像的分辨率。这种技术可以广泛地用于大口径望远镜的天文观测,例如地球的行星,类星体,也可以用于与波前校正有关的其他应用。

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