I am looking for companies capable of polishing aluminum at an ultrafine level. The resulting surfaces should have mean roughness of 5 angstrom or less.

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Rüdiger Rentsch

You may ask the Precision manufacturing Lab (LFM) at Univ. of Bremen, Germany. By roughness you mean Ra ? What would be the lateral dimensions of the flat (?) part ?

Reed Schmell

Try QED in Rochester, New York. Or start with a superpolished substrate and then deposit the Al onto the substrate . Coating should replicate the surface of the substrate.