Solar Laser

Stephen Hawking said that we can arrive to Proxima Centauri B in 20 years using solar sail and laser from earth, but we could also build a special satellite wich will orbit the sun and transform energy to photons for powering up our solar sail. Laser from the sun will be much more powerful and cheaper! This may be the way how we colonize the milky way, Dyson Spheres are not necessary!