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- W1985653283 abstract "Third-order nonlinearity and polarization holographic storage in acceptor-donor azo dye-doped PMMA films are studied by using nonresonant degenerate four-wave mixing with a He-Ne laser. The samples exhibit reasonably large third-order susceptibility and strong polarization sensitivity, and the highest third-order nonlinear susceptibility is up to the order of 10<SUP>-3</SUP> esu. The relationship between optical nonlinearity and 'push' and 'pull' electron ability in polar azo molecules is studied, and further effect from a push- electron group attached to azobenzene ring on third-order nonlinearity of the samples is explored. Third-order nonlinearity of the sample is found to be proportional to the push-pull electron ability of polar azo molecules. Attaching a side group with push-electron ability to the azobenzene ring increases third-order nonlinearity (dipole moment) of the material. Polarization holographic storage properties in azo dye-doped PMMA films are also studied. The samples show strong polarization sensitivity and real-time information storage properties. The polarization hologram in the sample results from a birefringent grating formed by photoinduced reorientation of polar azo molecules. The optical phase conjugation signal consists of both fast and slow parts when two recording beams are turned off. They respond to the processes of four-wave mixing and holographic grating. It is demonstrated that nonresonant nonlinearity of samples mainly results from photoinduced anisotropy of polar azo chromophores. The advantages of nonresonant nonlinearity and its applications are discussed." @default.
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- W1985653283 date "1998-10-16" @default.
- W1985653283 modified "2023-09-28" @default.
- W1985653283 title "<title>Third-order nonlinearity and polarization holographic storage in acceptor-donor azo dye-doped PMMA films</title>" @default.
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- W1985653283 doi "https://doi.org/10.1117/12.328185" @default.
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