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Creating deformations in aluminium!?

Creating deformations in aluminium!?

Creating deformations in aluminium!?

(OP)
I propose that I can create tiny raised 'bumps' in a thin sheet of aluminium, using a laser.  
I believe that I can use the laser to heat a tiny spot on the aluminium (say approaching 1 micron), not enough for the spot to melt but simply enough for thermal expansion to occur.  This will cause a tiny section of the metal to raise up, due to it expanding around that point, and as it is constrained by the cooler metal surrounding it.
I have a few questions about this:
  * Is this process feasable (i.e can it really work?)
  * How fast does this process occur?
  * Can the bumps turn back to the previous state? (flat)

Any help or infomation about this would be most apreciated.
  Thankyou. :)

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