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Amplitude variations on the ExAO testbed

机译:ExAO测试台上的振幅变化

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摘要

High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. At the Laboratory for Adaptive Optics on the Extreme Adaptive Optics testbed, we have already demonstrated wavefront control of better than 1 nm rms within controllable spatial frequencies. Corresponding contrast measurements, however, are limited by amplitude variations, including those introduced by the micro-electrical-mechanical-systems (MEMS) deformable mirror. Results from experimental measurements and wave optic simulations of amplitude variations on the ExAO testbed are presented. We find systematic intensity variations of about 2% rms, and intensity variations with the MEMS to be 6%. Some errors are introduced by phase and amplitude mixing because the MEMS is not conjugate to the pupil, but independent measurements of MEMS reflectivity suggest that some error is introduced by small non-uniformities in the reflectivity.
机译:众所周知,诸如对太阳系外行星成像所需的高对比度自适应光学系统需要出色的波前控制和衍射抑制。在极端自适应光学测试台上的自适应光学实验室,我们已经展示了在可控空间频率内优于1 nm rms的波前控制。然而,相应的对比度测量受到幅度变化的限制,包括那些由微机电系统(MEMS)可变形镜引入的变化。给出了在ExAO试验台上进行的幅度变化的实验测量和波光模拟的结果。我们发现系统的强度变化约为2%rms,而MEMS的强度变化为6%。由于MEMS不与光瞳共轭,因此会通过相位和幅度混合引入一些误差,但是对MEMS反射率的独立测量表明,由于反射率的微小不均匀性会引入一些误差。

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