argon ion laser An argon-ion laser is an ion laser that uses argon ions as the lasing medium. These lasers are used primarily to emit light at wave lengths of 458 nm, 488 nm or 514.5 nm, though it is possible to use them to emit several wavelengths of blue and green light. Argon-ion lasers can emit light at many different wave lenghts, and excite a number of different flourochromes. Daniel Schober John Quinn argon ion laser argon ion laser in a cytometer http://en.wikipedia.org/wiki/Laser#Gas_lasers ion laser metadata incomplete