Yeah, that stuff. A real easy read.
The goal is to fire a laser through a lens to produce a broad beam aimed somewhere near a target (maybe hundreds or thousands of miles away in space). The reflection enters an optical amplifier with a phase-conjugate mirror at the far end. The reflection gets pumped up into a strong enough beam to damage the target, and the mirror means that no particularly good aiming is needed to put 100% of beam energy on the target every time.
That's what they said when trying to get Star Wars funding anyway in the 1980s anyway. ICBMs would seem to move too fast for this. Using it to blind an airplane seems more realistic. The Germans above are trying to do something different: they've discovered a practical mirror and are trying to figure out what happens when it fires.
I kinda like the idea that someone might try to look up phase-conjugate mirrors for an optics class one day and wind up at a hardcore porn site.