標題: The effect of laser wavelength on the photorefractive characteristics of PMDA-DR19 based photorefractive polymeric materials
作者: Chang, CJ
Wang, HC
Liao, GY
Whang, WT
Liu, JM
Hsu, KY
材料科學與工程學系
光電工程學系
Department of Materials Science and Engineering
Department of Photonics
關鍵字: photoconductive;photorefractive;PMDA-DR19
公開日期: 1-九月-1997
摘要: The photoconductivity and photorefractive characteristics of PMDA-DR19-based photoconducting nonlinear optical polymeric films with different compositions were studied using red and green lasers. Contributions of dopants and the host to the photoconductive and photorefractive properties are systematically discussed. The virgin nonlinear optical material PMDA-DR19 was neither photoconductive nor photorefractive in nature. However, it became photoconductive and photorefractive once the charge transport material was incorporated into the PMDA-DR19/PVB polymer film. Films containing more nonlinear optical chromophore exhibited higher diffraction efficiency. Response speed was further elevated when an additional charge generation material was doped in. Diffraction grating was observed under zero electric field and was confirmed due to a photorefractive effect by the two-beam coupling effect. In addition to composition modification, the laser light source was also an important factor in changing the PR response speed. The photorefractive response speed was tremendously improved when films were written and read by two different laser beams, either red/green lasers or green/red lasers. (C) 1997 Elsevier Science Ltd.
URI: http://hdl.handle.net/11536/334
ISSN: 0032-3861
期刊: POLYMER
Volume: 38
Issue: 20
起始頁: 5063
結束頁: 5071
顯示於類別:期刊論文


文件中的檔案:

  1. A1997XU82300009.pdf