FAQ

Q

What is the advantage of machine tool polishing?

Machine based polishing is a precision and deterministic process: once you achieved high polishing quality, you can routinely repeat it. That is not a case for manual polishing with its hand-defined, non-deterministic nature.


Q

What is the advantage of super polishing ?

When super polished quality is achieved, the surface laser damage threshold equals to the bulk damage threshold and  surface  roughness is extremely  small.


Q

Which coating design is preferable for extra cavity tripling ?

We recommend high damage threshold triple antireflection coating on input side and  thin single wave antireflection coating on output side of LBO “


Q

What is the advantage of IBS coatings?

Ion beam sputtering (IBS) offers high packing density, low defect  and low absorption films.


Q

Why ion beam pre-cleaning is important?

Ion Beam pre-cleaning allows removing polishing re-deposition layer that is generated by superpolishing process.There is a misconception that superpolishing completely removes the subsurface damage layer. On the surface there is always a so-called polishing re-deposition layer containing traces of both substrate and polishing materials. Completely remove the redeposit can only be a dry ion milling such as Ion Beam Sputter cleaning.