High-Resolution X-Ray Imaging with Fresnel Zone Plates on the University of Rochester's OMEGA and OMEGA EP Laser Systems

Experiments performed on the OMEGA and OMEGA EP Laser Systems have utilized Fresnel zone plates (FZP's) to obtain x-ray images with a spatial resolution of as small as 1.6 $\mu $m, limited by the recording medium. Currently, single images are being obtained with either film, an x-ray charge-coupled device, or a framing camera at energies ranging from 2 to 8 keV. A time resolution of 100 ps is obtained by using a short-pulse backlighter or 30-ps time resolution is obtained using a framing camera with some compromise in spatial resolution. Example subjects, which have been imaged with FZP's, include shock-compressed, modulated surfaces that have undergone Rayleigh--Taylor unstable growth, self-emission from Cu-doped shells imploded by OMEGA, and implosions on OMEGA backlit by x-ray emission from Ti foils.