Figure 4
From: Generation of Scratches and Their Effects on Laser Damage Performance of Silica Glass

Damage performance of samples.
(a) Damage density at varied laser fluence which shows ZrO2-polished sample is superior to other samples; (b) surface of sample D before raster scan damage testing; (c) sample D after damage testing, from which it is clean that both brittle and ductile scratches can cause laser-induced damage.