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Lasing on the D_2 line of sodium in helium atmosphere due to optical pumping on the D_1 line (up-conversion)
A new method is proposed to produce population inversion on transitions
involving the ground state of atoms. The method is realized experimentally with
sodium atoms. Lasing at the frequency corresponding to the sodium D_2 line is
achieved in the presence of pump radiation resonant to the D_1 line with helium
as a buffer gas.Comment: 4 pages, 4 figures, Late