报告题目：A coronagraph using a liquid crystal array and a deformable mirror for active pupil apodizing and phase correction

报告人：  任德清（研究员）

时  间：  2011年7月1日（周五）下午4：00

地  点：  南京天光所办公实验大楼二楼会议室

报告摘要:

High-contrast imaging coronagraphs proposed until now all based on passive designs. That is, the coronagraph cannot be actively controlled to optimize for best performance. Pupil apodizing that modifies the light transmission on the pupil is one of the promising techniques for high-contrast imaging. Here, we proposed, in the first time, a high-contrast imaging coronagraph that integrated a liquid crystal array for active pupil apodizing and a deformable mirror for active phase correction. In such a way, source errors such as the initial transmission error and wave-front error can be actively controlled and compensated based on an optimized algorithm, which is optimized for maximum contrast in the discovery area on the focal plane. In addition, the using of a liquid crystal array makes this system more flexible that may create any apodizing pupil, including square or circle aperture with or without central obstruction, which make a universal coronagraph possible. In this talk, I will discuss the working principle and estimated performance of the coronagraph that is aimed for the high-contrast imaging with a ground-based and a space telescope, respectively.