We have observed stimulated emission on the transitions 43S1–33P°J near 518 nm following pulsed laser excitation of Mg vapor near the 31S0–31P°1 resonance at 285 nm. The emission has a divergence similar to the pump laser and closely follows the incident laser in time. The mechanism apparently involves pumping an accidental coincidence 31S0–31P°1 and 33P°J–53DJ, permitting depletion of the lower level of the triplet transition. Photoionization of the Mg vapor creates a large electron density (≲ 1013 cm−3); electron-impact collisions are presumed to mediate the process, transferring population from the laser-pumped 31P°l level to the triplet manifold.
© 1985 Optical Society of America
P. D. Kleiber, A. M. Lyyra, S. P. Heneghan, and W. C. Stwalley, "Stimulated emission in laser-pumped magnesium vapor," J. Opt. Soc. Am. B 2, 522-526 (1985)