Halftone Wave Front Control: Numerical Simulation and Laboratory Demonstration
Halftone Wave Front Control: Numerical Simulation and Laboratory Demonstration
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DOI：
10.3847/1538-3881/ac35e0
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Kenta Yoneta;N. Murakami;Hikaru Ichien;Seiji Sudoh;J. Nishikawa
中科院分区：
文献类型：
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作者：
Kenta Yoneta;N. Murakami;Hikaru Ichien;Seiji Sudoh;J. Nishikawa
高对比度的仪器需要直接成像暗淡的系外行星围绕明亮的主恒星。在高对比度的仪器中，需要一个波前控制系统来抑制残留的恒星斑点来产生黑洞。然而，可实现的对比度受到波前控制装置（如变形镜或空间光调制器）的相位量化误差（即有限相位分辨率）的限制。本文提出了一种半色调的波前控制方法，利用量子化相位调制的波前控制装置来提高对比度。在数值模拟中，通过半色调波前控制，对比度从1.4 × 10−9提高到3.8 × 10−10。此外，我们进行了实验室演示，其中使用空间光调制器进行波前控制，对比度从2.2 × 10−7提高到6.0 × 10−8，相位分辨率为2π/256。
High-contrast instruments are required for direct imaging of faint exoplanets around bright host stars. In high-contrast instruments, a wave front control system is needed to generate a dark hole by suppressing residual stellar speckles. However, the achievable contrast is limited by the phase quantization error (i.e., finite phase resolution) of wave front control devices, such as deformable mirrors or spatial light modulators. In this paper, we propose a halftone method for wave front control to improve the contrast using a wave front control device with quantized phase modulation. In a numerical simulation, the contrast was improved from 1.4 × 10−9 to 3.8 × 10−10 by halftone wave front control. In addition, we performed a laboratory demonstration in which a spatial light modulator was used for wave front control, and the contrast was improved from 2.2 × 10−7 to 6.0 × 10−8 for a phase resolution of 2π/256.