Opt Lett. 2015 Aug 1;40(15):3528-31. doi: 10.1364/OL.40.003528.
We propose a new type of wave-front sensor (WFS) derived from the pyramid WFS (PWFS). This new WFS, called the flattened pyramid-WFS (FPWFS), has a reduced pyramid angle in order to optically overlap the four pupil images into an unique intensity. This map is then used to derive the phase information. In this Letter, this new WFS is compared to three existing WFSs, namely the PWFS, the modulated PWFS (MPWFS), and the Zernike WFS (ZWFS) following tests about sensitivity, linearity range, and low-photon-flux behavior. The FPWFS turns out to be more linear than a modulated pyramid for the high-spatial order aberrations, but it provides an improved sensitivity compared to the non-modulated pyramid. The noise propagation may even be as low as the ZWFS for some given radial orders. Furthermore, the pixel arrangement being more efficient than for the PWFS, the FPWFS seems particularly well suited for high-contrast applications.
我们提出了一种源自金字塔波前传感器 (PWFS) 的新型波前传感器 (WFS)。这种新型 WFS 称为扁平化金字塔-WFS (FPWFS)，它的金字塔角度减小，以便将四个瞳孔图像光学重叠成一个独特的强度。然后，使用该图来得出相位信息。在这封信中，将根据灵敏度、线性范围和低光子通量行为对这种新的 WFS 与三种现有的 WFS 进行比较，即 PWFS、调制 PWFS (MPWFS) 和泽尼克 WFS (ZWFS)。对于高空间阶次像差，FPWFS 比调制金字塔具有更高的线性度，但与非调制金字塔相比，它提供了更好的灵敏度。在某些给定的径向阶数下，噪声传播甚至可能像 ZWFS 一样低。此外，由于 FPWFS 的像素排列比 PWFS 更有效，因此它特别适合高对比度应用。
