AZOBENZENE POLYMER FILMS FOR OPTICAL STORAGE AND HIGH-ORDER DIFFRACTION (I)——POLY[4'-BIS(N, N-OXYETHYLENE) IMINO-4-NITROAZOBENZENE SUCCINYL] FILM
WEI XIONG (魏雄), YAN XING-ZHONG (颜星中)a, LIN WEI-ZHU (林位株), MO DANG (莫党), LIANG ZHAO-XI (梁兆熙)b
Department of Physics, Zhongshan University, Guangzhou 510275, China; a State Key Laboratory of Ultrafast Laser Spectroscopy, Zhongshan University, Guangzhou 510275, China; c Istitute of Polymer Science, Zhongshan University, Guangzhou 510275, China
Abstract The properties of phase conjugated (PC) beam and stable optical storage in an azobenzene polymer film were studied by degenerate four-wave mixing. With low-intensity incident waves (peak value of the pulses of the order of W/cm2), the PC beam as well ms diffraction beams were observed and then disappeared after turning off one of the three incident Beams. When the peak intensities of the incidenl beams reached the order of 10 W/cm2, the PC beam did not disappear but decreased to some extent after turning off the writing beams. As the peak intensities of incident beams increased to the order of l03 W/cm2, diffraction up to 4th-order was observed. When all of the three incident waves were turned on, three groups of high-order forward and backward diffraction heams were observed. Turning off two of the three incident beams, the diffraction beams of the other incident beams did not decrease obviously, i.e., stable optical storage was realized. After the experiments, brilliant hologram spot was observed and could be maintained over 120 days without obvious change.
Received: 20 March 1995
Revised: 05 December 1995
Accepted manuscript online:
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