• Time-resolved laser saturation spectroscopy. Theory of the free induction decay of two-level saturation resonances

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    • Keywords

       

      Laser saturation spectroscopy; time-resolved spectroscopy; two-level systems; free induction decay; counter-propagating fields; co-propagating fields; population effects; coherence effects; three-photon process; Stark splitting; power broadening; atom-field interaction; osci

    • Abstract

       

      We give the theory of the free induction decay of two-level saturation resonances in the time-resolved laser saturation spectroscopy. The saturating and probe fields may be either co- or counter-propagating. The change-signal line-shape is analysed in detail in two cases of practical importance, namely when the saturating field is either strong or weak. The time evolution of the change-signal exhibits many interesting features which include Ramsey-type fringes, oscillatory decay, narrow resonances, line-narrowing etc. It is shown that by analysing the decay of the change-signal in time one can distinguish (i) various laser interaction processes such as population effects, coherence effects, three-photon Raman-type process, dynamic Stark splitting, power-broadening etc., and (ii) various relaxation mechanisms such as phase-changing collisions, etc.

    • Author Affiliations

       

      Sunil Kumar1 2 Martial Ducloy3

      1. Physics Department, Indian Institute of Technology, New Delhi - 110 029, India
      2. Length Standard Section, National Physical Laboratory, Hillside Road, New Delhi - 110 012, India
      3. Laboratoire de Physique des Lasers Université Paris-Nord, Villetaneuse - 93430, France
    • Dates

       
  • Pramana – Journal of Physics | News

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