极高对比度成像空间光调制器的相位量化研究
Phase Quantization Study of Spatial Light Modulator for Extreme High contrast Imaging
摘要：
由于太阳系外行星与主星的光度比很大，因此通过反射的星光直接对太阳系外行星进行成像极具挑战性。波前控制是抑制散斑噪声以获得极高对比度的关键技术。我们提出了一个相位量子化的空间光调制器的波前控制，以满足探测类地行星的太阳型恒星的宜居带的对比度要求。我们进行了数值模拟，采用SLM与不同的相位精度和致动器的数量，这是相关的可实现的对比度。我们使用一种优化算法来解决与SLM的可控相位步长相匹配的量化问题。两种光学配置的SLM位于之前和之后的日冕焦平面掩模进行了讨论。仿真结果约束了SLM在上述两种光学配置下的相位精度要求。最后，我们已经证明，SLM与更多的致动器可以提供一个有竞争力的对比度性能，通过使用变形镜。
英文摘要：
Direct imaging of exoplanets by reflected starlight is extremely challenging due to the large luminosity ratio to the primary star. Wave-front control is a critical technique to attenuate the speckle noise in order to achieve an extremely high contrast. We present a phase quantization study of a spatial light modulator for wave front control to meet the contrast requirement of detection of a terrestrial planet in the habitable zone of a solar-type star. We perform the numerical simulation by employing the SLM with different phase accuracy and actuator numbers, which are related to the achievable contrast. We use an optimization algorithm to solve the quantization problems that is matched to the controllable phase step of the SLM. Two optical configurations are discussed with the SLM located before and after the coronagraph focal plane mask. The simulation result has constrained the specification for SLM phase accuracy in the above two optical configurations. Finally, we have demonstrated that a SLM with more actuators can deliver a competitive contrast performance to that by using a deformable mirror.
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