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Spectrally-Resolved Femtosecond-Four-Wave Mixing on Semiconductors

  • T. Rappen
  • U. Peter
  • W. Schäfer
  • M. Wegener
Part of the NATO ASI Series book series (NSSB, volume 330)

Abstract

Femtosecond-four-wave mixing is a powerful tool to study the loss of coherence (dephasing) of elementary excitations in solids1. Usually the spectrally integrated, diffracted wave is detected as a function of time delay. It is, however, in many situations a priori not clear, which states actually contribute to the coherent diffracted wave. In order to get a more detailed understanding of the coherent dynamics of continuum states and their interplay with excitons, we spectrally resolve the diffracted wave in femtosecond-four-wave mixing as a function of time delay for different excitation conditions2. We also investigate the dependence of the four-wave-mixing spectra on the polarization of the two incident beams. These low-density results deliver information on the density dependence of the dephasing time of both, continuum and exciton states.

Keywords

Continuum State Diffract Wave Exciton State Polarization Dependence Linear Birefringence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • T. Rappen
    • 1
  • U. Peter
    • 1
  • W. Schäfer
    • 2
  • M. Wegener
    • 1
  1. 1.Institut für PhysikUniversität DortmundDortmundFederal Republic of Germany
  2. 2.HLRZForschungszentrum JülichJülichFederal Republic of Germany

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