GAIN Another term for amplification.
GAS DISCHARGE LASER A laser containing a gaseous lasing medium in a glass tube
in which a constant flow of gas replenishes the molecules depleted by the electricity
or chemicals used for excitation.
GAS LASER A type of laser in which the laser action takes place in a gas medium.
GATED PULSE A discontinuous burst of laser light, made by timing (gating) a
continuous wave output - usually in fractions of a second.
GAUSSIAN CURVE NORMAL Statistical curve showing a peak with even distribution
on either side. May either be a sharp peak with steep sides, or a blunt peak with
shallower sides. Used to show power distribution in a beam. The concept is important
in controlling the geometry of the laser impact.
GROUND STATE Lowest energy level of an atom.