
452
Laser-Induced Damage in Optical Materials
both, an e-beam coating and ion-assisted coating as a function of time during evacua-
tion and rell with ambient atmosphere.
A shi to shorter wavelengths is typically found with e-beam coatings (with a rela-
tive shi Δλ/λ on the order of a few percent), and an almost immediate response to the
falling and rising pressure in the vacuum chamber is observed. Principally, the process
is reversible, but much longer timescales of several hours have to be taken into account
to reach the initial value aer complete rell. On the other hand, ion-assisted coat-
ings show a very small or not measurable vacuum sh ...