Imaging through a thin scattering layer and jointly retrieving the point-spread-function using phase-diversity

光纤分布式声传感用扩频码的对比分析

Comparative Analysis of Spread-Spectrum Codes for Fibre-Optic Distributed Acoustic Sensing

本文通过数值模拟对比多种编码序列的性能，发现高多样性序列在光纤分布式声传感系统中相位噪声鲁棒性更优，明确了相关质量、相位噪声鲁棒性与实现约束间的性能权衡。

An analytic expression for coronagraphic imaging through turbulence. Application to on-sky coronagraphic phase diversity

The ultimate performance of coronagraphic high contrast exoplanet imaging systems such as SPHERE or GPI is limited by quasi-static aberrations. These aberrations produce speckles that can be mistaken for planets in the image. In order to design instruments, correct quasi-static aberrations or analyse data, the expression of the point spread function of a coronagraphic instrument in the presence of residual turbulence is most useful. Here we derive an analytic expression for this point spread function that is an extension to coronagraphic imaging of Roddier's expression for imaging through turb…

Moment analysis of focus-diverse point spread functions for modal wavefront sensing of uniformly illuminated circular-pupil systems

A new concept of using focus-diverse point spread functions (PSFs) for modal wavefront sensing (WFS) is explored. This is based on relatively straightforward image moment analysis of measured PSFs, which differentiates it from other focal-plane wavefront sensing techniques (FPWFS). The presented geometric analysis shows that the image moments are non-linear functions of wave aberration coefficients, but notes that focus-diversity (FD) essentially decouples the coefficients of interest from others, resulting in a set of linear equations whose solution corresponds to modal coefficient estimates.…

Shack-Hartmann sensor as an imaging system with a phase diversity

Conventional methods of wavefront reconstruction from the raw data of the Shack-Hartmann sensor use the focal spot shifts and discard the high-frequency information about the wavefront. Phase-retrieval-based methods treat the Hartmann pattern as the diffraction image and use the Rayleigh-Sommerfeld propagation to estimate the wavefront with greater accuracy and resolution. In this Letter, we propose a novel approach to the phase-retrieval-based reconstruction by considering the Hartmann pattern as a point-spread function of a general imaging system with an introduced phase diversity of a speci…

Image Reconstruction with Analytical Point Spread Functions

The image degradation produced by atmospheric turbulence and optical aberrations is usually alleviated using post-facto image reconstruction techniques, even when observing with adaptive optics systems. These techniques rely on the development of the wavefront using Zernike functions and the non-linear optimization of a certain metric. The resulting optimization procedure is computationally heavy. Our aim is to alleviate this computationally burden. To this aim, we generalize the recently developed extended Zernike-Nijboer theory to carry out the analytical integration of the Fresnel integral …

用于三维光学信息处理的通用点扩散函数工程

Universal point spread function engineering for 3D optical information processing

本文提出通用PSF工程框架，利用级联透射表面构成的空间非相干衍射处理器合成任意空间变化三维PSF，并数值验证无滤光片、无扫描、无数字重建的快照式三维多光谱成像。