Abstract
The velocity selective optical pumping technique has been used to obtain the Doppler-free spectrum of the $D1$ transition of sodium in the temperature range 110--169 \ifmmode^\circ\else\textdegree\fi{}C. The pump-induced changes in probe transmission across the Lamb dip and crossover resonances first increase and then decrease with temperature. We also observe a reversal in the relative magnitudes of these changes among some of the narrow resonances. These and other temperature-dependent features of the Doppler-free spectrum of the $D1$ transition of sodium are successfully explained within the framework of the composite five-level model. The degeneracies of the ground-state composite levels and the beam depletion effects at higher temperatures play a crucial role in these investigations.
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