giant rubies? i'll assume you're serious. most lasers now are solid state, use diodes. most before that were gas lasers, using inert gases. neon, with helium produced red, argon produced blue-green, krypton produced an off white.
don't think anyone makes ruby lasers now, too inefficient.
a one watt solid state laser can be hand held. a one watt gas laser (visible light) is a giant tube with huge power supply and had to be water cooled.
cutting/welding lasers used to be co2, not a visible beam, don't know what's used now.
been out of the biz for a long time. can't wait for handheld diode laser that will produce 590nm yellow light. that's cheap. very expensive at present.
oh yeah, a one watt laser will blind you, will burn you, will start a fire. not a toy.