They could be useful for some specific applications, but lasers have very limited effective range as power delivery systems when you're looking at the interplanetary scale. Unless you have very large collectors that is.

For example, for the lunar laser ranging experiment they use telescopes to direct the beam at the moon, but the beam is still 6.5 km wide at the moon's surface.

https://en.wikipedia.org/wiki/Lunar_Laser_Ranging_experiment