Experimental study of ablation pressures and target velocities obtained in 0.26 μm wavelength laser experiments in planar geometry

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Abstract
In 0.26 μm wavelength laser experiments that were performed in planar geometry with irradiances between 1013 and 1015 W/cm2, the ablation pressure and the target velocity have been measured using a shock‐velocity measurement and the double foil technique, respectively. The conditions are discussed that must be satisfied if the double‐foil technique is to give an accurate measurement of the velocity of the dense part of the target. The rocket model has also been improved using a time‐dependent applied pressure pulse, in order to accurately describe the relation between ablation pressure, target velocity, and ablated fraction. Pressures up to 50 Mbar have been easily generated since lateral energy transport is rather low with a 0.26 μm wavelength laser.