首页> 外文会议>Advances in Adaptive Optics II pt.2 >Laboratory demonstration of a focal plane coronagraphic interferometer designed for anti-halo apodization of starlight
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Laboratory demonstration of a focal plane coronagraphic interferometer designed for anti-halo apodization of starlight

机译:用于星光抗晕变迹的焦平面冠层干涉仪的实验室演示

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The coronagraphic focal plane interferometer reflects away the core starlight with a mirror in the focal plane and uses it to form a coherent interferometric reference beam. This is used in a Mach-Zehnder configuration with phase shifting to measure the complex amplitude of the star halo speckles in the focal plane where the interference takes place. We present results from a laboratory prototype in which the speckles are suppressed over half the field by modifying the wavefront in a pupil plane with a MEMS deformable mirror, based on a Fourier transform of the complex halo derived from the focal plane interferometric data. Even deeper suppression of the residual stellar halo over the full 360 degree field will be possible by explicitly constructing an "anti-halo" from the reference beam; a new technique for exoplanet imaging (Codona and Angel, 2004). We present the design and current status of a laboratory prototype to study anti-halo apodization. The spatially-filtered core starlight will be modulated by deformable mirrors in a Michelson configuration to form a temporally-coherent copy of the measured residual complex halo, with the same amplitude but opposite phase (i.e. an "anti-halo"). Using components with only modest control accuracy, the method has the potential to reduce an already low residual halo by an additional two decades.
机译:冠状焦平面干涉仪使用焦平面中的镜子反射核心星光,并使用它形成相干干涉参考光束。它用于具有相移的Mach-Zehnder配置中,以测量发生干扰的焦平面中的星晕斑点的复振幅。我们提供了一个实验室原型的结果,其中通过基于焦平面干涉测量数据得出的复杂光晕的傅立叶变换,通过使用MEMS变形镜修改光瞳平面中的波前,在整个场的一半上抑制了斑点。通过在参考光束中明确构造一个“反晕”,有可能在整个360度视场上更深入地抑制剩余的恒星晕。一种新的系外行星成像技术(Codona和Angel,2004年)。我们目前的研究原型和研究现状,以研究抗晕变迹。经空间滤波的核心星光将通过迈克尔逊配置的可变形反射镜进行调制,以形成具有相同幅度但相反相位(即“反光晕”)的时间测量相干副本,以测量残留光晕。使用仅具有适度控制精度的组件,该方法有可能将已经很低的残留光晕再减少二十年。

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