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<p>[QUOTE=&quot;Collect89, post: 1351318, member: 15445&quot;]You would probably want to deliver more power than would be possible with a solid state DVD burner laser diode.&nbsp; The reason you would want more power is that you would want to modulate the power or duty cycle of the beam in order to deliver just the right amount of power to melt away your defects.&nbsp; You would also need some nice objective optics to focus the beam on the coin&#039;s surface &amp; maybe even read the coin&#039;s surface through the same objective lens with a different light.&nbsp; This is the kind read-write stuff that is done in laser beam recorders (LBRs) that are used to make prerecorded DVDs (not burn DVD recordable discs).&nbsp; The laser beam recorders&nbsp; for DVD mastering typically use gas lasers or solid state lasers in the range of 50 to 100 watts.[/QUOTE]</p><p><br /></p>

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