Abstract
Photographic evidence is presented of the back‐face spallation of 1.0‐mm 6061‐T6 aluminum samples irradiated in vacuum by 1.5‐nsec 1.06‐μ laser pulses. Thinner samples (0.5 mm) have also been spalled and complete back‐face separation has been achieved. It is demonstrated that the degree of spallation is a strong function of fluence and that target coupling can be enhanced by means of prepulses.

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