Fig. 2: Relative reflectivity change ΔR/R0 of Au immersed in air and water after being subjected to pump pulses with peak fluences of 1.0 ∙ Φthr (left column), 1.5 ∙ Φthr (middle column), and 3.0 ∙ Φthr (right column).
From: Comparison of ultrashort pulse ablation of gold in air and water by time-resolved experiments
a Transient ΔR/R0 for irradiation in air (black lines and squares) and water (blue lines and circles). The red dotted vertical lines indicate a delay time of Δt = 1 ps. b Spatially resolved relative reflectivity change at Δt = 1 ps. The vertical white line within each image separates the optical response in air (left half) and water (right half). White arrows indicate the direction from which the pump-pulse was incident on the sample surface. The black dashed rectangle at 3.0 ∙ Φthr highlights the reflectivity change along the pump-pulse propagation path
