Single-shot multi-planar wave-front measurement with multi-focal Fibonacci sieves

Abstract

Wave-front measurement based on coherent diffraction imaging (CDI) is a promising method for measuring wave-front aberrations, which has wide applications ranging from optical testing to adaptive optics. This study proposes a single-shot multi-planar wave-front measurement with multi-focal Fibonacci sieves to reconstruct the wave-front distribution of small transmissive objects. A Fibonacci sieve was designed to simultaneously capture multi-planar diffraction patterns at a single recording plane; thus, a multi-planar CDI algorithm can be used to reconstruct the test wave-front by a set of extracted sub-graphs. Its feasibility was proved in the optical region experimentally. Since diffractive optical elements used in the experiment are amplitude-only elements, the proposed wave-front measurement method opens up the possibility of practical real-time and on-line wave-front measurement ranging from x rays to terahertz.