Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 94, Issue 4, Pages 653-659Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-009-3369-3
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Funding
- National Science Foundation of China [10675083]
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A novel azobenzene-containing fluorinated polyimide was synthesized. The nonlinear optical property and photoinduced birefringence of a polyimide thin film were investigated. Large third-order nonlinear refraction (n (2)=-4.49x10(-11) cm(2)/W) was observed in the polyimide thin film by carrying out Z-scan measurement. The polyimide thin film exhibited larger nonlinear refraction than that of a mono-azo dye doped PMMA thin film (n (2)=-1.63x10(-12) cm(2)/W). The photoinduced birefringence of the polyimide thin film (a-mu n similar to 10(-2)) under different pump intensities was investigated; it was much larger than that of the mono-azo dye doped PMMA thin film (a-mu n similar to 10(-3)). Moreover, the time constants for birefringence growth and relaxation processes were determined.
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