Detection of High Frequency Acoustic Transients using Coherent EUV Light

摘要

Ultrafast Extreme Ultraviolet (EUV) radiation is used to probe transient surface phenomenon in three experimental geometries. Optical irradiation of the sample surface generates thermal and acoustic transients that are subsequently probed with a time-delayed EUV pulse. In all experimental geometries we show excellent signal-to-noise ratios (>10:1) and increased sensitivity to surface deformations (<.02nm) directly attributable to the reduced wavelength of the probing light.