Liu Ming, Dong Bing
Opt Express. 2022 Mar 14;30(6):9088-9102. doi: 10.1364/OE.453176.
The correction of wavefront sensorless adaptive optics (WFSless AO) can be significantly accelerated by using a holographic modal wavefront sensor (HMWFS). The HMWFS is realized by a computer-generated hologram (CGH) into which all aberration modes to be detected are encoded and only a single-shot image is required for simultaneous measurement of multiple modes. The conventional HMWFS suffers from a quite limited dynamic range and severe inter-modal crosstalk which deteriorates the sensing accuracy. We proposed a novel HMWFS with a large dynamic range and no crosstalk and validated its performance by simulation and experiment. In the improved HMWFS scheme, the aberration is represented by Lukosz modes whose gradients are orthogonal and the modal coefficients can be estimated independently. Instead of using a binary CGH in conventional HMWFS, a kinoform CGH with high diffraction efficiency is adopted in the improved HMWFS. The kinoform CGH is produced by a phase-only liquid-crystal spatial light modulator (LCSLM) which also serves as a wavefront corrector in our WFSless AO system.
通过使用全息模态波前传感器（HMWFS），可显著加速无波前传感器自适应光学（WFSless AO）的校正。HMWFS由计算机生成全息图（CGH）实现，要检测的所有像差模式都编码在其中，并且同时测量多个模式仅需单幅图像。传统的HMWFS动态范围相当有限且存在严重的模式间串扰，这会降低传感精度。我们提出了一种具有大动态范围且无串扰的新型HMWFS，并通过仿真和实验验证了其性能。在改进的HMWFS方案中，像差由梯度正交的卢科斯模式表示，并且模态系数可独立估计。改进的HMWFS中采用了具有高衍射效率的相息图CGH，而不是传统HMWFS中使用的二元CGH。相息图CGH由纯相位液晶空间光调制器（LCSLM）产生，该调制器在我们的无波前传感器AO系统中也用作波前校正器。
