
400
Laser-Induced Damage in Optical Materials
morphologies grows at dierent laser uences, so understanding of the laser operating
environment and the potential contaminates is critical.
14.6.1 Particulates
To help understand laser cleaning of particulates, nite element electromagnetic eld
calculations of a sphere on a reective surface show signicant SWEF enhancement
(Luk’yanchuk et al., 2004). Because of the high SWEF enhancement, both transmissive
(see Figure 14.10) and highly absorbing particulates can be ablated at the operating laser
wavelength. Ionization of these particulates during laser exposure can result in surface
plasmas exceed ...