Abstract

This is the first reported demonstration of the use of pair-absorption transitions for optically pumping lasers. In a mixture of barium and thallium metal vapors, single-photon absorption of 3867-Å laser light caused simultaneous excitation of colliding ground-state atoms to the Ba(6s6pP11°) and Tl(6pP23/2°) excited states. Excited-state densities of about 1014 cm−3 were created, and subsequent laser emission on the Ba(6s6pP11°)Ba(6s5dD12) atomic transition at 1.5 μm was observed.

© 1980 Optical Society of America

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