We have observed stimulated emission on the transitions 43S1−33PJ° near 518 nm following pulsed laser excitation of Mg vapor near the 31S0−33P1° 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 31S0−33P1° and 33PJ°−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 31P1° level to the triplet manifold.
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Kleiber et al. (1985) studied this question.
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