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Well IR is not as bad as some think, its more or less a heat ray and tends to absorb quickly I see green lasers doing the most damage to the eyes and UV lasers are bad for the skin.
When you ask the most harmful you need to specify with or without goggles, I can tell you this a 445nm blue with the right focus "feels" like you are stabbing yourself with a hot soldering iron. The darker you are the more it would hurt.
Green is very bright so without goggle you could get optical damage quickly even at lower powers say bellow 100mw
A co2 laser is esay to block with goggles but a direct skin hit focused would make a cracking noise.(ouch)
When you ask the most harmful you need to specify with or without goggles, I can tell you this a 445nm blue with the right focus "feels" like you are stabbing yourself with a hot soldering iron. The darker you are the more it would hurt.
Green is very bright so without goggle you could get optical damage quickly even at lower powers say bellow 100mw
A co2 laser is esay to block with goggles but a direct skin hit focused would make a cracking noise.(ouch)