Calibration of quasi-static aberrations in high-contrast astronomical adaptive optics with a pupil-modulated point-diffraction interferometer.
Calibration of quasi-static aberrations in high-contrast astronomical adaptive optics with a pupil-modulated point-diffraction interferometer.
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DOI：
10.1364/oe.26.011068
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发表时间：
2018-04
期刊：
影响因子：
3.8
通讯作者：
Nicolas S. Dubost;N. Bharmal;R. Myers
中科院分区：
文献类型：
--
作者：
Nicolas S. Dubost;N. Bharmal;R. Myers
对系外行星的直接探测和成像需要使用高对比度的自适应光学（AO）。在这些系统中，准静态像差需要高度校正和校准。为了实现这一点，提出了一种高灵敏度的波前传感器，光瞳调制点衍射干涉仪（m-PDI）。该传感器调制和检索输入电场的相位和振幅。对波前重构、条纹可见度、色效应和噪声传播等理论进行了研究。结果表明，该干涉仪具有较宽的色带宽。对于带宽为Δλ = 50%的中心波长单位，条纹的可见性和WFS对低阶和高阶像差的响应几乎不受单色情况的影响。相比之下，WFS对其针孔大小的变化非常敏感。针孔的大小示出影响传感器的线性度，动态范围和噪声量。较大的针孔使传感器对低阶像差不太敏感，但反过来也降低了未对准的影响。
The direct detection and imaging of exoplanets requires the use of high-contrast adaptive optics (AO). In these systems quasi-static aberrations need to be highly corrected and calibrated. In order to achieve this, a high-sensitivity wavefront sensor, the pupil-modulated point-diffraction interferometer (m-PDI), is presented. This sensor modulates and retrieves both the phase and the amplitude of an incoming electric field. The theory behind the wavefront reconstruction, the visibility of fringes, chromatic effects and noise propagation are developed. Results show this interferometer has a wide chromatic bandwidth. For a bandwidth of Δλ = 50% in units of central wavelength, the visibility of fringes and the response of the WFS to low and high-order aberrations are almost unaffected with respect to the monochromatic case. The WFS is, in contrast, very sensitive to variations in the size of its pinhole. The size of the pinhole is shown to affect the sensor's linearity, the dynamic range and the amount of noise. Larger pinholes make the sensor less sensitive to low-order aberrations, but in turn also decrease the effects of misalignments.