Lasing on the D₂ line of sodium in helium atmosphere due to optical pumping on the D₁ line (up-conversion)
classification
⚛️ physics.optics
keywords
linesodiumatomsheliumlasingmethodachievedatmosphere
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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.
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