This is a pretty cool initiative — I looked into beamed propulsion a bit while teaching a course this past fall, and it seems to me that if we (or human technologies) are going to reach a star in our lifetimes, this is by far the most likely way. Still
very challenging though.
For a quite detailed recent treatment of optical/IR propulsion see: [this paper by Philip Lubin](http://www.deepspace.ucsb.edu/wp-content/uploads/2015/04/A-R...)
For a thorough, if somewhat outdated, treatment of the [“starwisp”](https://en.wikipedia.org/wiki/Starwisp) idea using microwaves rather than optical/IR lasers, see [this paper](http://path-2.narod.ru/design/base_e/starwisp.pdf) by Robert Forward.
To poll the success of this overall endeavor, as well as start to make predictions about which components will/won’t work, [Metaculus](http://www.metaculus.com/questions/#/?order_by=-publish_time) is launching a series of questions —check it out if you have expertise or opinion.
