Comment Precision and Relativity (Score 3, Informative) 31
Yes, this is proof of concept stage.
The key issue with the laser approach is not just power, but aiming precision. The better they columate the beam to focus the transmitted power, the better they need to aim the beam to actually hit the receiver. A deep space craft is only so large, and 200 inch telescopes are also a tiny target to hit at these distances. The mass curvature of space and the motion of objects need to be accounted for, as distance adds signal delay.