Quintavalla M, Bergomi M, Magrin D, Bonora S, Ragazzoni R
Appl Opt. 2020 Jun 10;59(17):5151-5157. doi: 10.1364/AO.393499.
Adaptive optics (AO) correction based on pyramid wavefront sensors (P-WFSs) has been successfully implemented in several instruments for astronomical observation due to the P-WFS advantages in terms of sensitivity with respect to other WFSs, such as the Shack-Hartmann. The correction of non-common path aberrations (NCPAs) between the sensing and the scientific arm, commonly performed introducing offsets to the Zernike coefficients of the measured wavefront in the AO closed loop, reduces the sensitivity of P-WFSs causing a loss in sky coverage and scientific throughput. We propose a technique to exploit the full capabilities of P-WFSs compensating the NCPAs up to the fourth order on the WFS channel by means of a multi-actuator adaptive lens (MAL). We show the preliminary results obtained in a dedicated laboratory test bench.
基于金字塔波前传感器（P-WFS）的自适应光学（AO）校正已在一些天文观测仪器中成功实现，这是因为P-WFS在灵敏度方面相对于其他波前传感器（如夏克-哈特曼传感器）具有优势。传感臂和科学臂之间的非共路像差（NCPA）校正通常是在AO闭环中对测量波前的泽尼克系数引入偏移量来进行的，这会降低P-WFS的灵敏度，导致天空覆盖范围和科学通量损失。我们提出一种技术，通过多致动器自适应透镜（MAL）在WFS通道上补偿高达四阶的NCPA，以充分发挥P-WFS的能力。我们展示了在专用实验室测试台上获得的初步结果。
