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Absorptive Coating on Copper for CO2 Laser

2001

I am looking for a coating that is absorptive to light of around 10.6 microns (10600nm). The part is basically a power sink for high power lasers so the local temperatures will get fairly high, especially if the thermal conductivity is not very high. The temperature will also be changing very quickly. I plan to use copper for the part because of its thermal characteristics.

I have considered a flame sprayed Magnesium Oxide coating because I am fairly confident it will be absorbing. Aluminum oxide and I think Beryllium oxide are also absorbing to this wavelength (although BeO might be a safety hazard). A local coating service place mentioned an Ebonal coating, what is this coating chemically? In a previous post on this website hard black chrome was mentioned for a lower wavelength (1000nm).

Any help would be greatly appreciated,

Jim M [last name deleted for privacy by Editor]
- Santa Rosa, California