Snapshot coherent diffraction imaging across ultra-broadband spectra  

作　　者：BOYANG LI ZEHUA XIAO HAO YUAN PEI HUANG HUABAO CAO HUSHAN WANG WEI ZHAO YUXI FU 

机构地区：[1]Center for Attosecond Science and Technology(CAST),Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 710119,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Photonics Research》2024年第9期2068-2077,共10页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2022YFE0111500);Young Scientist Basic Research Program of the Chinese Academy of Sciences(YSBR-091);Natural Science Basic Research Program of Shaanxi Province(2019JCW-03);Major Science and Technology Infrastructure Pre-research Program of the CAS(J20-021-III);Key Deployment Research Program of XIOPM(S19-020-III);Innovation Team in Shaanxi Province(2021TD-01);Youth Innovation Promotion Association of the Chinese Academy of Sciences(2021404);International Partnership Program of Chinese Academy of Sciences(115GJHZ2023023FN).

摘　　要：Ultrafast imaging simultaneously pursuing high temporal and spatial resolution is a key technique to study the dynamics in the microscopic world.However,the broadband spectra of ultra-short pulses bring a major challenge to traditional coherent diffraction imaging(CDI),as they result in an indistinct diffraction pattern,thereby complicating image reconstruction.To address this,we introduce,to our knowledge,a new ultrabroadband coherent imaging method,and empirically demonstrate its efficacy in facilitating high-resolution and rapid image reconstruction of achromatic objects.The existing full bandwidth limitation for snapshot CDI is enhanced to∼60%experimentally,restricted solely by our laser bandwidth.Simulations indicate the applicability of our method for CDI operations with a bandwidth as high as∼140%,potentially supporting ultrafast imaging with temporal resolution into∼50-attosecond scale.Even deployed with a comb-like harmonic spectrum encompassing multiple octaves,our method remains effective.Furthermore,we establish the capability of our approach in reconstructing a super-broadband spectrum for CDI applications with high fidelity.Given these advancements,we anticipate that our method will contribute significantly to attosecond imaging,thereby advancing cutting-edge applications in material science,quantum physics,and biological research.

关 键 词：COHERENT thereby SPECTRA 

分 类 号：O436.1[机械工程—光学工程] TP391.41[理学—光学]