Although this is a cool theory. I don't think its possible to go through the glass and water and burn them. It would most definitely burn them if you pulled the rock out and have it closer.
Lasers do work for this, theres several videos on youtube of it.
In the linked videos they're using a 445nm violet-blue laser pointer, the burner laser is 650nm red (for DVD burner lasers) but should have the same effect.
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