Frequency-dependent polarization of light scattered near theNa D2resonance line

摘要: We report measurements of the degree linear polarization scattered light as a function excitation frequency near Doppler-broadened $\mathrm{Na} D2$ resonance line. For resonant $D2$ line, hyperfine interaction strongly depolarizes emitted due to precession electronic angular momentum $\stackrel{\ensuremath{\rightarrow}}{\mathrm{J}}$ prior spontaneous emission. However, laser is tuned away from resonance, sharply rises level predicted using simple $J{M}_{J}$ basis, i.e., neglecting any coupling with nuclear spin $\stackrel{\ensuremath{\rightarrow}}{\mathrm{I}}$. Roughly speaking, there transition $F$ selection rules ($\stackrel{\ensuremath{\rightarrow}}{\mathrm{F}}=\stackrel{\ensuremath{\rightarrow}}{\mathrm{I}}+\stackrel{\ensuremath{\rightarrow}}{\mathrm{J}}$) for $J$ off-resonant excitation. present rigorous calculation use multipole moments density matrix which agrees quantitatively our data and also predicts complicated interference structure when Doppler broadening negligible. show that this may shift peaks observed in precision laser-spectroscopy experiments. transitions we discuss simplified approach (based on an approximation Voigt profile) treats separately contributions scattering.