Accession Number : ADA262189


Title :   Polar Order and Relaxation of Second Order Nonlinear Optical Susceptibility in an Electric Field Polarized Amorphous Polymer


Descriptive Note : Technical rept.


Corporate Author : NEBRASKA UNIV LINCOLN DEPT OF CHEMISTRY


Personal Author(s) : Wang, C H ; Gu, S H ; Guan, H W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262189.pdf


Report Date : Jan 1993


Pagination or Media Count : 28


Abstract : The dependence of the second harmonic generation (SHG) signal of an amorphous polymer system containing nonlinear optical (NLO) chromophores on the polarizing electric field is investigated. It is shown that under a weak poling field condition, the SHG intensity is proportional to E sub p2, provided that the polarizing electric field E sub p is greater than a threshold field, E sub s. Above E sub s the macroscopic polar orientational order is established. The lengthening of the relaxation time for polar orientational order with increasing E sub p is also observed. Theoretical analysis shows that the relaxation time is proportional to the polar order initially induced by the polarizing field. Experiments have been carried out to confirm the theoretical prediction.


Descriptors :   *POLARIZATION , *POLYMERS , *POLYMETHYL METHACRYLATE , *RELAXATION TIME , *ELECTRIC FIELDS , PREDICTIONS , HARMONICS , NONLINEAR OPTICS , OXIDES , TIN , FIELD CONDITIONS , INDIUM , SIGNALS , COATINGS , FILMS , ORIENTATION(DIRECTION) , INTENSITY , CHROMOPHORES , SECOND HARMONIC GENERATION


Subject Categories : Organic Chemistry
      Polymer Chemistry
      Electricity and Magnetism
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE