Quasi-CW, high numerical aperture, inductively excited ion laser

Abstract

Taking advantage of the wide bandwidth possible with inductive excitation at audio-frequencies, square-wave excitation at 2.5 kHz has been employed to obtain laser oscillation of the 4880-Å ArII transition in a high numerical aperture active medium 1 cm in diam and 15 cm long, without the aid of an axial magnetic field. © 1967 The American Institute of Physics.