Time and Intensity Dependence of the Infrared Absorption of SF6: Measurements with an Injection-Locked Single Mode TEA CO2 Laser

  • S. D. Smith
  • W. E. Schmid
  • F. M. G. Tablas
  • K. L. Kompa
Part of the Springer Series in Chemical Physics book series (CHEMICAL, volume 6)


With SF6 established as the model polyatomic molecule for studies of absorption of high power infrared laser radiation it is surprising that few measurements of the time-development of absorption during a laser Dulse have been made. Those published refer1–4 to intensities between 10-104 W/cm2, Rabi flop times > 10 ns and time resolution ~10 ns, where coherent effects, such as selfinduced transparancy and pulse delay, can be observed for transitions essentially between 2 levels. Time-integrated absorption has been reported, e.g. 5-8 fluences, ø from 1 mJ/cm2 − 10 J/cm2 (3 KW/cm2 − 30 MW/cm2). For most excitation frequencies the absorption cross section, σ, falls as ø-1/3 from ~ 10-18 − 10-19 cm2. These values are in contrast to the low intensity value which is as high as 1.7 ß 10-17 cm2.5


Absorption Cross Section Incident Intensity Pump Pulse Duration Double Resonance Experiment Effective Absorption Cross Section 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1979

Authors and Affiliations

  • S. D. Smith
    • 1
  • W. E. Schmid
    • 1
  • F. M. G. Tablas
    • 1
  • K. L. Kompa
    • 1
  1. 1.Projektgruppe für Laserforschung der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V.Garching bei MünchenFed. Rep. of Germany

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