<title>Four-wave mixing and photoconductivity properties of two photorefractive polymers</title>

Abstract

Photorefractive four-wave mixing (FWM) and photoconductivity properties of two new polymers are investigated. One polymer is composed ofphotoconducting poly(n-vinylcarbazole) (PVK), photosensitizing 2,4,7-trinitro-9-fluorenone (TNF), and optically nonlinear 4-(dicyanovinyl)-N.N-diethylaniline (DCVDEA). Its FWM diffraction efficiency and response time as a function of, respectively, electric field and writing intensity have been determined. With a 80-pm-thick film, a FWM diffraction efficiency of 7.4 x i04 has been obtained. The response time of the polymer is as short as 400 ms at a writing intensity of 0. 17W/cm2. Another polymer is composed of PVK, TNF,. Its photoconductivity and photocarrier generation efficiency have been determined experimentally at different electric fields and wavelengths.