No, this is the problem the US has been having problems with their current "Star wars" thing.
As a laser is shone through the atmosphere, it diffuses, although it may start at 1cm wide and be super concentrated, by the time it gets to the hight of a jumbo-jet, its spread to over 1meter. This means the energy imparted per square cm is far less, so you need an increasingly powerful and focussed laser the higher you try to shoot stuff.
A tactical laser weapon? Been talking about it for ages especially in reference to point defence on ships who have more power available than other platforms but there's lots of prototype laser weapons around from field portable to tank size (Plus microwave and electrical weapons, Joy! )
that aint shit, you want a real laser, go to the rutherford appleton labs near oxford and ask for the "vulcan" - they use it to simulate temperatures hotter than anywhere in/on the sun. For a very tiny amount of time it runs at a peta-watt