We examine the relationship between pulse energy and the morphology of damage by a femtosecond pulsed laser, tightly focused onto the back surface of glass. For fluences up to three times that of threshold, an unexpected discontinuity in the scaling of damage size is caused by ejection of rings of material surrounding central damage that appear above a sharp threshold fluence. A mechanism for the production of these structures via thermal expansion and shockwave generation is proposed.

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