Japan has operated a solar sail near the orbit of Venus, several countries and companies are running experiments on using them to make satellites deorbit faster, the Planetary Society is launching Lightsail-2 on the next Falcon Heavy, and the Breakthrough Starshot hopes to make scifi a reality and shine a huge laser on tiny chip-scale spaceships to send them to Alpha Centauri.
It's great to see progress -- I just meant I'm curious about building the sails in space for higher performance, and haven't heard about anyone else trying to refine those ideas.
