Ultra-broadband diffractive imaging with unknown probe spectrum  

作　　者：Chuangchuang Chen Honggang Gu Shiyuan Liu 

机构地区：[1]State Key Laboratory of Intelligent Manufacturing Equipment and Technology,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China [2]ptics Valley Laboratory,Wuhan,Hubei 430074,China

出　　处：《Light(Science & Applications)》2024年第10期2276-2287,共12页光（科学与应用)（英文版）

基　　金：the technical support from the Experiment Centre for Advanced Manufacturing and Technology in School of Mechanical Science&Engineering of HUST;supported by the Natural Science Foundation of China(52130504);Key Research and Development Program of Hubei Province(2021BAA013);Innovation Project of Optics Valley Laboratory(OVL2023PY003);Natural Science Foundation of Hubei Province(2021CFB322);Fundamental Research Funds for the Central Universities(2021XXJS113);Guangdong Basic and Applied Basic Research Foundation(2023A1515030149).

摘　　要：Strict requirement of a coherent spectrum in coherent diffractive imaging(CDI)architectures poses a significant obstacle to achieving efficient photon utilization across the full spectrum.To date,nearly all broadband computational imaging experiments have relied on accurate spectroscopic measurements,as broad spectra are incompatible with conventional CDI systems.This paper presents an advanced approach to broaden the scope of CDI to ultra-broadband illumination with unknown probe spectrum,effectively addresses the key challenges encountered by existing state-ofthe-art broadband diffractive imaging frameworks.This advancement eliminates the necessity for prior knowledge of probe spectrum and relaxes constraints on non-dispersive samples,resulting in a significant extension in spectral bandwidth,achieving a nearly fourfold improvement in bandlimit compared to the existing benchmark.Our method not only monochromatizes a broadband diffraction pattern from unknown illumination spectrum,but also determines the compressive sampled profile of spectrum of the diffracted radiation.This superiority is experimentally validated using both CDI and ptychography techniques on an ultra-broadband supercontinuum with relative bandwidth exceeding 40%,revealing a significantly enhanced coherence and improved reconstruction with high fidelity under ultra-broadband illumination.

关 键 词：SPECTRUM ILLUMINATION COHERENT 

分 类 号：O43[机械工程—光学工程]