| Abstrakt: |
Results on quasi-resonant optical pumping of Yb vapors by KrF*-laser radiation (λp = 248 nm) are presented. The radiation was converted to the visible range to be available for study. Strong lines of amplified spontaneous emission are detected. These lines are due to transitions between the groups of even (6s5d1D2, 6s6d3D1, 2, 3) and odd Yb levels (6s6p1P10, 6s6p3P0,1,20). Coherent radiation is detected at Yb resonance lines with λ = 398.8 and 555.6 nm, which are caused, respectively, by the 6s6p1P10 → 6s6s1S0 and 6s6p3P10 → 6s6s1S0 transitions in the Yb atom. A sequence of processes that lead to the formation of inversion at the Yb atomic transitions is qualitatively examined. [ABSTRACT FROM AUTHOR] |
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