DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
Final rept. 1 Jul 1991-31 Jul 1993
HCC SCIENCE AND TECHNOLOGY CO INC SUMMIT NJ
Pagination or Media Count:
While numerous photorefractive polymers were synthesized by the incorporation of NLO chromophores and photoconductive components as side chains on a backbone, the most significant photorefractive behavior demonstration under this project was made in an electrooptic aminonitrostilbene methacrylate copolymer P2ANSMMA without the addition of photoconductive compounds. By four wave mixing, photorefractive gratings were written in P2ANSMMA using s-polarized and p-polarized writing beams and probed using orthogonally polarized probe beams. With probe beam orthogonally polarized to the write beams, well behaved, field dependent, stable responses ascribed to the photorefractive effect were observed. Diffraction efficiencies of 10exp-4-10exp-5 were obtained in 8 micrometers thick films under an applied field of 50 Vmicrometers with response times of 1.5 - 2 minutes. Increasing the sample thickness to 100 micrometers is projected to result in a diffraction efficiency of 1 - 3.
APPROVED FOR PUBLIC RELEASE