Hi there,

When ablating polyimide structures, sometimes instead of getting a
clean finish you actually produce very small cone like structures in
the ablated section. This phenomena is due to particles of carbon
landing on the substrate and therefore acting as a mask.

Does anyone know of a method of replicating this onto a copper,
aluminium or gold substrate rather then the polymide substrate that i am currently aware of (i.e. what
material is required to act as the small particles for the mask, how would the particles be
applied and at what size, what laser fluence levels are required and
at what wavelength ?).

Thanks very much

Gareth Jones
Celestica Ltd
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