The laser system shown in the top photo is similar in efficiency. And, trust me, the engineers are very aware of it. It's also frighteningly expensive, with a l

The laser system shown in the top photo is similar in efficiency. And, trust me, the engineers are very aware of it. It's also frighteningly expensive, with a large number of exotic things. (Source: I work with the guy who designed a big chunk of the receiver circuitry, among other things.)