Abstract
CW laser operation was observed at transitions of Kr II, Ar II and Xe II in noble gas mixture hollow cathode discharges. The laser transitions are excited in two steps: 1) ionization of atoms, 2) excitation of ions to the upper laser state. It is shown that in contrast to the pulsed positive column system the dominant process of ionization of Kr atoms is not Penning collisions but electron impact. This result is found to be valid also for the CW He−Ar and He−Ne−Xe hollow cathode ion lasers. Excitation of ground state ions to the upper laser state is considered to be second kind collisions with metastable atoms.
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Jánossy, M., Tuovinen, P. On the excitation mechanism of hollow cathode CW noble gas mixture ion lasers. Acta Physica 46, 167–175 (1979). https://doi.org/10.1007/BF03159428
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DOI: https://doi.org/10.1007/BF03159428