Accession Number : ADA329665

Title :   Thermal Relaxation Processes and Stability in Poled Electro-Optic Polymers.

Descriptive Note : Final rept. 1 Apr 93-31 Mar 97,

Corporate Author : CASE WESTERN RESERVE UNIV CLEVELAND OH

Personal Author(s) : Singer, Kenneth D.

PDF Url : ADA329665

Report Date : AUG 1997

Pagination or Media Count : 77

Abstract : The goal of gaining better understanding of the orientational decay mechanisms of poled nonlinear optical polymers and to develop a predictive description of the long time scale decay was well met. We developed a new experimental technique based on electric field induced second harmonic generation in the frequency domain to probe the polymer over many decades of time. This technique is best applied near the glass transition to probe frequencies from mHz to tens of kHz. We used this technique along with others to study a variety of polymers. Applying an Adams-Gibb model to the temperature dependence of the characteristic frequency, prediction of long term behavior at any temperature based on quick measurements near the glass transition temperature is possible. We also developed a new ultrafast laser source for studying nonlinear optical susceptibilities, and contributed to the study of cross-linked polyimide materials as stable and processable hosts for poled electro-optic polymers.

Descriptors :   *ELECTROOPTICS, *RELAXATION, *DECAY, CHROMOPHORES, THIN FILMS, OPTICAL MATERIALS, ELECTRIC FIELDS, CROSSLINKING(CHEMISTRY), TRANSITION TEMPERATURE, THERMAL ANALYSIS, FREQUENCY DOMAIN, CONTINUOUS WAVE LASERS.

Subject Categories : Physical Chemistry
      Electrooptical and Optoelectronic Devices
      Plastics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE