Complex sentence: Neodymium-YAG is the most widely used active laser medium in solid-state lasers, being used for everything from low-power continuous-wave lasers to high-power Q-switched (pulsed) lasers with power levels measured in the kilowatts.
Split into simpler sentences: Neodymium-YAG is the most widely used active laser medium in solid-state lasers. YAG lasers are used in high-power Q-switching applications for pulsed lasers with power levels measured in the kilowatts.