Interaction-time-averaged optical pumping in alkali-metal-atom Doppler spectroscopy

Thomas Lindvall, Ilkka Tittonen

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)


    We study the influence of optical pumping on Doppler-broadened alkali-metal-atom D line spectra by solving the time-dependent density matrix for an open two-level system. The time-dependent absorption is averaged over the distribution of interaction times obtained from the three-dimensional beam geometry and atomic velocity distribution and over the longitudinal velocity distribution. The optical pumping is significant at much lower intensities than saturation and depends strongly on the intensity, beam radius, vapor cell length, and spontaneous-decay branching ratio. The result is in agreement with our earlier steady-state solution for a wide range of parameters and predicts two interesting line-shape features.

    Original languageEnglish
    Article number032505
    JournalPhysical Review A - Atomic, Molecular, and Optical Physics
    Issue number3
    Publication statusPublished - 9 Sept 2009
    MoE publication typeA1 Journal article-refereed


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