Applied Physics B

, Volume 61, Issue 3, pp 223–242

Models, predictions, and experimental measurements of far-infrared NH3-laser dynamics and comparisons with the Lorenz-Haken model


  • C. O. Weiss
    • Physikalisch-Technische Bundesanstalt, Lab. 4.42
  • R. Vilaseca
    • Departament de Fisica i E.N.Universitat Politècnica de Catalunya
  • N. B. Abraham
    • Department of PhysicsBryn Mawr College
  • R. Corbalán
    • Departament de FísicaUniversitat Autònoma de Barcelona
  • E. Roldán
    • Departament d'OpticaUniversitat de València
  • G. J. de Valcárcel
    • Departament de Física AplicadaUniversitat Politècnica de València
  • J. Pujol
    • Departament d'Optica i OptometriaUniversitat Politècnica de Catalunya
  • U. Hübner
    • Physikalisch-Technische Bundesanstalt, Lab. 4.42
  • D. Y. Tang
    • Department of PhysicsUniversity Queensland
Invited Paper

DOI: 10.1007/BF01082041

Cite this article as:
Weiss, C.O., Vilaseca, R., Abraham, N.B. et al. Appl. Phys. B (1995) 61: 223. doi:10.1007/BF01082041


Dynamics of the intensity and optical field amplitude of a coherently pumped far-infrared NH3-laser are measured and characterized. The experimental findings in certain parameter ranges closely follow the dynamics of the Lorenz model and its generalization for laser systems. Similarities and some specific differences are found in geometrical or statistical characterizations of the attractors. The experimental results are also consistent with the results of a model of optically pumped three-level lasers which takes into account the presence of a multiplicity of velocity groups as well as three-level coherence effects. For a certain region in parameter space, this far more complex model with a much larger phase space produces results similar to the dynamics of the Lorenz model. The model also provides explanations of differences between the experimental results and results from the Lorenz model.


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© Springer-Verlag 1995