Director of Research (if dissertation) or Advisor (if thesis)
Eden, James G.
Doctoral Committee Chair(s)
Eden, James G.
Committee Member(s)
Gruebele, Martin
Swenson, Gary R.
Carney, Paul S.
DeMarco, Brian L.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Quantum beating
Raman scattering
Four-wave mixing
Pump-probe spectroscopy
Alkali vapor
Abstract
Probing the interactions between a mode-locked laser pulse and saturated rubidium vapor
with a pump–probe technique has resulted in observations of coherences within the atom
that persist longer than 150 ps. Quantum beats due to the interference between the 7S
and 5D_{5/2} energy states were observed by a four-wave mixing process. The difference
frequency between the 5D–5P_{3/2} and the 5P_{3/2}–5S transitions was also observed for
interpulse delays up to 180 ps. The temporal evolution of the beat amplitude indicates the
existence of a superfluorescent process and a scattering process detected simultaneously
with the four-wave mixing process. A model was developed to explain the processes and
was used to predict the range of pulse parameters for which the scattering process and
four-wave mixing could be simultaneously detected.
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