Wikipedia
A ruby laser is a solid-state laser that uses a synthetic ruby crystal as its gain medium. The first working laser was a ruby laser made by Theodore H. "Ted" Maiman at Hughes Research Laboratories on May 16, 1960.
Ruby lasers produce pulses of coherent visible light at a wavelength of 694.3 nm, which is a deep red color. Typical ruby laser pulse lengths are on the order of a millisecond.
Usage examples of "ruby laser".
As he climbed the dais, Corbal watched him, his gaze like a ruby laser.
The rings are edge on, for the lily pad continent floats above an ocean of cold gas along Saturn's equator, and they glitter like a ruby laser beam slashed across the sky.
A bright ruby laser beam stabbed out from somewhere down the corridor, striking him on the side of his neck.
A ruby laser lit it brilliantly, but diffused, its attacker already deep in atmosphere.
He hit the thumb switch on the vector-controller and sent a ruby laser bolt screaming out into the distance.
If Krysty had been there she'd have pinned down the intruders like a ruby laser.