High-contrast imaging stability using MEMS deformable mirror
High-contrast imaging stability using MEMS deformable mirror
复制标题
使用 MEMS 可变形镜实现高对比度成像稳定性
DOI：
10.1117/12.2525628
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发表时间：
2019
影响因子：
3.5
通讯作者：
F. Shi
中科院分区：
文献类型：
--
作者：
Camilo Mejia Prada;E. Serabyn;F. Shi
在反射星光中直接成像类地系外行星需要高对比度成像系统，如日冕仪，在较宽的光谱范围内，星光抑制效果好于1e-10。这种深对比度只能通过波前控制技术(例如，散斑归零、电场共轭、行程最小化…)来实现其中可变形反射镜可校正低频和中频光学像差。在太空中，波前控制的日冕仪将在指向科学恒星之前使用目标恒星创建高对比度区域。在空间望远镜重定向时，可变形反射镜的表面稳定性对维持高对比度区域将起到非常重要的作用。在这项工作中，我们报道了用于高对比度成像的MEMS可变形反射镜的光学特性和稳定性分析，利用真空涡旋日冕仪模拟空间环境。我们使用电场共轭创建了高对比度区域，并使用成对估计来监测其几个小时的演变。
Direct imaging of Earth-like exoplanets in reflected starlight requires high contrast imaging systems, such as coronagraph, with starlight suppression better than 1e-10 over a broad spectral band. Such deep contrast can only be achieved by means of wavefront control techniques (e.g. speckle nulling, electric field conjugation, stroke minimization…) where deformable mirrors correct for low and mid-frequency optical aberrations. In space, the coronagraph with wavefront control will create high contrast regions using a target star before pointing to a science star. While re-pointing the space-telescope, the surface stability of the deformable mirrors will play a very important role in maintaining the high contrast regions. In the present work, we report an optical characterization and stability analysis of MEMS deformable mirrors for high contrast imaging using a vortex coronagraph in vacuum to simulate space conditions. We created high contrast regions using electric field conjugation and monitored its evolution for several hours using pair-wise estimation.