Extreme adaptive optics testbed: high contrast measurements with a MEMS deformable mirror
Extreme adaptive optics testbed: high contrast measurements with a MEMS deformable mirror
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极端自适应光学测试台：使用 MEMS 可变形镜进行高对比度测量
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
S. Olivier
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文献类型：
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作者：
J. W. Evans;K. Morzinski;Layra Reza;S. Severson;L. Poyneer;B. Macintosh;D. Dillon;G. Sommargren;D. Palmer;D. Gavel;S. Olivier
“极端”自适应光学系统是针对超高对比度应用进行优化的，例如地基太阳系外行星探测。加州大学圣克鲁斯分校的极端自适应光学试验台正被用于研究和开发高对比度成像技术，特别是波前控制技术。我们使用一个简单的光学设计，以尽量减少波前误差，并最大限度地提高实验可实现的对比度。相移衍射干涉仪（PSDI）测量波前误差，具有亚纳米精度和精度，用于计量和波前控制。以前，我们已经证明了RMS波前误差为<1.5 nm and a contrast of >107在一个相当大的区域使用一个形状的瞳孔没有变形镜。目前的工作包括安装和表征的1024致动器微机电系统（MEMS）变形镜，由波士顿微机械制造的主动波前控制。使用PSDI作为波前传感器，我们已经将可变形反射镜平坦化到<1 nm within the controllable spatial frequencies and measured a contrast in the far field of >106。一致的扁平化要求测试和表征的个别致动器的响应，包括死和低响应致动器的影响。还测试了MEMS器件的稳定性和可重复性。最终，该测试台将用于测试太阳系外行星寻找AO系统系统架构的各个方面。
"Extreme" adaptive optics systems are optimized for ultra-high contrast applications, such as ground-based extrasolar planet detection. The Extreme Adaptive Optics Testbed at UC Santa Cruz is being used to investigate and develop technologies for high-contrast imaging, especially wavefront control. We use a simple optical design to minimize wavefront error and maximize the experimentally achievable contrast. A phase shifting diffraction interferometer (PSDI) measures wavefront errors with sub-nm precision and accuracy for metrology and wavefront control. Previously, we have demonstrated RMS wavefront errors of <1.5 nm and a contrast of >107 over a substantial region using a shaped pupil without a deformable mirror. Current work includes the installation and characterization of a 1024-actuator Micro-Electro-Mechanical-Systems (MEMS) deformable mirror, manufactured by Boston Micro-Machines for active wavefront control. Using the PSDI as the wavefront sensor we have flattened the deformable mirror to <1 nm within the controllable spatial frequencies and measured a contrast in the far field of >106. Consistent flattening required testing and characterization of the individual actuator response, including the effects of dead and low-response actuators. Stability and repeatability of the MEMS devices was also tested. Ultimately this testbed will be used to test all aspects of the system architecture for an extrasolar planet-finding AO system.