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Ion Assisted Deposition (coating technology)

  1. May 13, 2015 #1
    Hi all,

    When talking to some of our optics vendors, I got the impression that Ion Assisted Deposition (IAD) is standard. We use our optics at high power densities and we care about laser damage as well as adhesion and density of the coating (aka porosity, helps reduces sensitivity to humidity). Cost is an issue as well (counting dollars, not cents).
    We have some versions of general notes WRT coating technology or performance needed (i.e. "non absorbing" or "oxide coatings") but I found them vague and wanted to improve. I don't have evidence showing electron beam evaporation is not good enough but from what I read I understand that IAD is better, and I was even told that because it is faster it is sometimes even cheaper (not sure this statement is true, though).
    I was about to change all our drawings to actually require IAD when I got some feedback from other vendors that use "thermal evaporation" instead. This doesn't fall into any category I was aware of. I am mostly ignorant in coating technologies other than some reading I've done lately (the best I found was actually on PrecisionPhotonics aka CVI website). I couldn't find any reference to this question that is not vendor-biased. I also couldn't find an industry standard (like MIL-STD) specifying coating technologies or how to specify how dense the coating is without saying "IAD" etc. I am ignoring specification of reflectivity or absorption per ISO 11551 or abrasion resistant as I think I need to specify the general note as well. Feel free to argue :-)
    Looking for your feedback on these two aspects:
    1. What is considered industry standard WRT coating technology actually in use
    2. How to specify the coating in the best way.

    Thanks
    Ornit
     
  2. jcsd
  3. May 18, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
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