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.
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Zarowin et al. (1967) studied this question.
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