Orientational Pair Correlation, Polar Order Parameter and Temporal Stability in the Second Harmonic Generation of Amorphous Polymers

Abstract

Measurements of the second harmonic generation (SHG) signal were made on the DAN/PMMA guest/host system as a function of the nonlinear optical (NLO) chromophore concentration and the poling field strength. The temporal stability of the SHG signal, after the poling field was removed, was also investigated. The polar orientational order parameters, L(sub 33) and L(sub 31) (see text for definition), were deduced from the second order nonlinear susceptibility. Both of the polar orientational order parameters and the relaxation time of the nonlinear susceptibility were found to increase with increasing NLO chromophore concentration. The concentration dependence was interpreted as due to the anisotropic intermolecular interaction, particularly the dipole-dipole interaction. The anisotropic intermolecular interaction introduces the orientational pair correlation function which enhances the polar order as well as the temporal stability of the NLO effect.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1993
Accession Number
ADA262013

Entities

People

  • C. H. Wang
  • H. W. Guan
  • Shou-Shu Gong
  • T. Goodson Iii

Organizations

  • University of Nebraska-Lincoln Department of Chemistry

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Classification
  • Electric Fields
  • Glass
  • Glass Transition Temperature
  • Lasers
  • Light Scattering
  • Materials
  • Measurement
  • Molecules
  • Optical Materials
  • Orientation (Direction)
  • Physics
  • Refractive Index
  • Relaxation Time
  • Second Harmonic Generation
  • Transition Temperature

Readers

  • Materials Science and Engineering.
  • Quantum Chemistry