Lasing on the D2 line of sodium in helium atmosphere due to optical pumping on the D1 line (up-conversion)
Abstract
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 D2 line is achieved in the presence of pump radiation resonant to the D1 line with helium as a buffer gas.
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