I'm a bit surprised at the downvotes. I'm no scientist, but I meant this suggestion in earnest. As far as my layman's knowledge goes, I've always understood the Moon's He-3 reserves to be a "vast, as-yet-untapped power resource".
So it would be awesome to directly pump the laser from H3 fusion.
H3 fusion is actually very easy - I think we could do it today. We just don't have a readily available source of H3 for fuel.
However, 3He fusion with net power output is exceptionally hard, even with complete disregard to cost. Much harder than deuterium-tritium fusion. We don't know how to do it yet.