KnowraRuby laserLinked fromLinked fromThe 6 pages that link to Ruby laser, each with the reason it gives.All 6Broader topic 4Compared with 2LaserBroader topic: Maiman's first working laser used ruby and emitted pulsed red light.Population inversionBroader topic: Its three-level scheme illustrates the substantial pumping needed to invert a laser transition.Helium–neon laserCompared with: It is an early solid-state alternative, unlike the continuously operated gas-discharge helium–neon laser.Solid-state laserBroader topic: Its chromium ions illustrate how dopants create laser transitions in a crystal host.Nd:YAG laserCompared with: Its three-level operation requires more pumping than Nd:YAG’s four-level transition.Nikolay BasovBroader topic: It was an early practical realization of optical amplification developed from quantum-electronics research.