And that's why they don't. Once you find that the design is impracticable (can't be done, for technical, logistical, or financial reasons), you sigh and roll up the drawings and wait for time to change the circumstances or boundary conditions. Lasers are not magical contrivances; they require lots of heavy, expensive technology and plenty of power supply.
Do you really think that everything that has been designed has been built? There are various levels of design. And there are whole coffee table books about the advanced aircraft designed by the Third Reich which never were built. The U.S. has plenty of abandoned or down-selected designs that either were not built or only made it to the point of a mock-up or prototype.
And that's why they don't. Once you find that the design is impracticable (can't be done, for technical, logistical, or financial reasons), you sigh and roll up the drawings and wait for time to change the circumstances or boundary conditions. Lasers are not magical contrivances; they require lots of heavy, expensive technology and plenty of power supply.
Do you really think that everything that has been designed has been built? There are various levels of design. And there are whole coffee table books about the advanced aircraft designed by the Third Reich which never were built. The U.S. has plenty of abandoned or down-selected designs that either were not built or only made it to the point of a mock-up or prototype.