lasers... so many different types????

First of all, thanks to all that responded to my first laser question..... What I found out is how much I don't know about all the different types of lasers!

So my question is.. What type of laser should I be looking for to do engraving (wood, plastics)? And where would a good place be to start my search, knowing I am on a very limited budget.

Russ



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