论文标题
自适应光学中波前传感的高动态范围点差异干涉仪的概念验证
Concept validation of a high dynamic range point-diffraction interferometer for wavefront sensing in adaptive optics
论文作者
论文摘要
直接检测系外行星需要使用高对比度自适应光学器件（AO）。在这些系统中，需要高度校正和校准准静态畸变。为了实现这一目标，在较早的论文中介绍了学生调制的点差干涉仪（M-PDI）。本文通过三个实验侧重于M-PDI概念验证。首先，仪器的精度和动态范围的特征是在所有空间频率和不同振幅下测量空间传递函数。然后，使用可见的单色光，在系统的系统偏置上关闭了自适应光学控制回路，以测试精度和完整性。在学生总半径的72％的中央部分中，残留误差为7.7nm-RMS。最后，使用频谱FWHM在R波段周围的光谱FWHM使用的多色灯运行。控制回路相对于单色案例没有表现下降，达到了大于0.7的最终StREHL比率。
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, the pupil-modulated point-diffraction interferometer (m-PDI), was presented in an earlier paper. This present paper focuses on m-PDI concept validation through three experiments. First, the instrument's accuracy and dynamic range are characterised by measuring the spatial transfer function at all spatial frequencies and at different amplitudes. Then, using visible monochromatic light, an adaptive optics control loop is closed on the system's systematic bias to test for precision and completeness. In a central section of the pupil with 72% of the total radius the residual error is 7.7nm-rms. Finally, the control loop is run using polychromatic light with a spectral FWHM of 77nm around the R-band. The control loop shows no drop in performance with respect to the monochromatic case, reaching a final Strehl ratio larger than 0.7.
