Hi,
Is it true that at first IAD and IBS coated optical elements may behave similarly, but over time the IAD coating may peel off or degrade, especially when exposed to humidity or high-power laser radiation?
Thanks,
Assaf
IAD is a process for assisting the deposition. There is a second beam with certain energy which needs to be optimised. If not, then IBE may provide better material adhesion.
Assaf, I will refer two sites.
http://www.reoinc.com/technical-resources/cat/78/technical_tutorials/article/Coating_Process_Tutorial
Coating process difference: “IAD is a variant of the electron-beam evaporation process which adds a high energy ion beam that is directed at the part to be coated…. In IBS, a high energy ion beam is directed at a target (metals or oxides). The ions transfer their momentum to the target material, causing atoms or molecules to sputter off. These high energy atoms then deposit onto the parts to be coated.”
This difference makes difference in the packing density in coating layers which is responsible to imperviousness to water vapor.
“The high energy of the ion beam sputtering process results in extremely uniform, high density, completely amorphous films with excellent adhesion to the substrate."
This advantage is also claimed by another coating company.”
http://advancedthinfilms.com/Capabilities/IBS-Thin-film-Coatings
Unlike conventional evaporative coatings that have porous microstructures, IBS thin films have densely packed structures that make them impervious to water vapor. Consequently, our IBS coatings are insensitive to changes in environmental conditions such as heat, humidity and pressure. Shigeo
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