Carrying one's power supply onboard a rocket in space and even on an airplane is a huge weight penalty. What if high energy density beams could power a substant

Carrying one's power supply onboard a rocket in space and even on an airplane is a huge weight penalty. What if high energy density beams could power a substantial VASIMR thruster? That would make for awesome LEO to GEO orbital tugs. It would also be a good basis for a drone "space fighter" that could reduce the rocket equation penalty through ultra high ISP. Reliable high density power beaming could enable fully automated cargo drone aircraft. These would have fundamental advantages in operations costs due to weight savings, the simplicity of electric motors, and reduced personnel costs. If we could generate large amounts of power in space and use sufficiently large transmitters (re: diffraction limits) to beam it to VASIMR thruster spacecraft, we could substantially reduce transit times to Mars, as one example. Alternatively, we could also greatly increase mass fractions of cargo delivery to Mars.