Why are there different types of lasers for laser cutting?

I know theres 3 main types but why dose need different ones why cant you just use the same one or:I know theres 3 main types but why dose need differe

I know theres 3 main types but why dose need different ones why can't you just use the same one

or:I know theres 3 main types but why dose need different ones why can't you just use the same one

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