Measurements of single mode and multiple mode laser imprint on Vulcan

A single mode optical perturbation is imprinted by direct drive laser irradiation on thin Al foils at 3-5x10^12 W/cm^2. The single mode optical intensity pattern is generated as an interference fringe pattern from two small apertures placed into one beam of the Vulcan laser. The imprinted modulation, and subsequent Rayleigh-Taylor instability growth is recorded as a function of time by XUV radiography using a Ge XUV laser backlighter. We characterized the imprint due to 15-90 μm optical perturbation wavelengths, as well as the imprint due to multiple mode speckle patterns generated with RPP, SSD, and ISI smoothing on Vulcan. We present results of the single mode and multiple mode imprint experiments on thin Al foils. We will also discuss further experiments using a Sm XUV laser to measure imprinted modulations in CH targets.