title: A high-resolution two-dimensional imaging velocimeter.
abstract: Velocity interferometers are typically used to measure velocities of surfaces at a single point or along an imaged line as a function of time. We describe an optical arrangement that enables high-resolution measurements of the two-dimensional velocity field across a shock front or shocked interface. The technique is employed to measure microscopic fluctuations in shock fronts that have passed through materials being considered as ablators for indirect-drive inertial confinement fusion. With picosecond time resolution the instrument captures velocity modes with wavelengths as short as 2.5 microm at a resolution of approximately 10 m/s rms on velocity fields averaging many km/s over an 800 microm field of view.
authors.affiliation: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA. celliers1@llnl.gov
authors.forename: P M
authors.initials: PM
authors.lastname: Celliers
authors.forename: D J
authors.initials: DJ
authors.lastname: Erskine
authors.forename: C M
authors.initials: CM
authors.lastname: Sorce
authors.forename: D G
authors.initials: DG
authors.lastname: Braun
authors.forename: O L
authors.initials: OL
authors.lastname: Landen
authors.forename: G W
authors.initials: GW
authors.lastname: Collins