For this one, blame my wife. I think.
Laser Mines (TL[7+3])
Yes, as in ‘big holes in the ground where you dig solid, raw laser light out of the walls.’ Sure, you could make laser beams by collimating light into a focused ray. If you’re living in the 21st century AD, that is. But if you’re a clear-eyed citizen of any number of the modern, technologically mature polities of the 23rd Century’s Solar System, you’d rather get your laser beams from a mine on one of Jupiter or Saturn’s moons. And yes, it’s real laser light, somehow. Still usable, though! …Well, after a certain amount of refining into a crystal form, that is.