Why aren't laser weapons used?

No.11803530 ViewReplyOriginalReport
They seem like the perfect weapon for destroying missiles and aircraft? Why isn't the use of extremely powerful lasers more common? You would only have to destroy the fins and the missile would deviate from its target and be uncontrollable. The only weapons system that uses laser is a joke and can barely take down weak targets. Why can't we simply create a more powerful laser?