Numerical refocusing of 2d-VISAR data

[摘要] Two dimensional velocity interferometer (2d-VISAR) data can be treated as a kind of hologram, since fringes recorded by the interferometer manifest both phase and magnitude information about changes in the optical field of the target, over an image. By the laws of diffraction, knowledge of the optical field at one focal plane can be used to calculate the optical field at another focal plane. Hence a numerical re-focusing operation can be performed on the data post-experiment, which can bring into focus narrow features that were recorded in an out of focus configuration. Demonstration on shocked Si data is shown.

[发布机构] Lawrence Livermore National Laboratory, PO Box 808, Livermore; CA; 94551, United States^1;Los Alamos National Laboratory, Los Alamos; NM; 87545, United States^2;Department Earth and Planetary Science, University of California, Berkeley; CA; 94720, United States^3

[关键词] Focal Plane;Magnitude information;Optical field;Out-of-focus;Velocity interferometer