Recorded 12 October 2022. Yukio Takahashi of Tohoku University presents "Recent progress in coherent diffraction imaging at SPring-8" at IPAM's Diffractive Imaging with Phase Retrieval Workshop. Abstract: Coherent diffraction imaging (CDI) is a powerful method for visualizing the structure of an object with a high spatial resolution that exceeds the performance limits of the lens, in which the object is irradiated with a coherent beam, and phase retrieval calculations are performed on the measured diffraction intensity pattern to obtain the object image. So far, we have developed a high-resolution ptychographic CDI system at SPring-8 [1-3], and applied it to imaging of catalytic materials [4,5] and battery materials [6,7]. Ptychographic CDI is superior in that it enables the observation of extended samples. Its disadvantage is that it is difficult to improve its temporal resolution since it is based on multiple-frame data collection. It is therefore desirable to establish a method of reconstructing the image of an extended object from a single-frame diffraction intensity pattern. Recently, we have proposed and demonstrated a practical method for single-frame CDI [8,9], in which a triangular aperture is used as a key element for the optical system. In this talk, I intend to discuss recent progress in ptychographic CDI and single-frame CDI at SPring-8. Learn more online at: http://www.ipam.ucla.edu/programs/workshops/workshop-i-diffractive-imaging-with-phase-retrieval/?tab=schedule References [1] Y. Takahashi et al., Phys. Rev. B 80, 054103 (2009) [2] Y. Takahashi et al., Phys. Rev. B 83, 214109 (2011) [3] M. Abe et al., J. Synchrotron Rad. 28, 1610-1615 (2021) [4] M. Hirose et al., Angew. Chem. Int. Ed. 130, 1490-1495 (2018) [5] M. Hirose et al., Communications Chemistry 2, 50 (2019) [6] H. Uematsu et al., J. Phys. Chem. Lett. 12, 5781-5788 (2021) [7] M. Abe et al., J. Phys. Chem. C (in press) [8] J. Kang et al., Opt. Express 29, 1441-1453 (2021) [9] S. Takazawa et al., Opt. Express 29, 14394-14402 (2021)