12 May 2004 Photoinduced molecular orientation in bulk azodye-doped polymer by nonresonant femtosecond laser pulses
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Proceedings Volume 5280, Materials, Active Devices, and Optical Amplifiers; (2004); doi: 10.1117/12.516686
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China
Abstract
We show two kinds of photoinduced molecular orientations in bulk azodye-doped polymers: photoinduced molecular orientation with centrosymmetry and photoinduced molecular orientation with noncentrosymmetry. For the photoinduced molecular orientation with centrosymmetry, the samples were irradiated with a linearly polarized femtosecond laser whose wavelength (800 nm) was out of the absorption range of the azodye molecules. This photoinduced molecular orientation with centrosymmetry resulted in a birefringence in the sample, based on which an optical image storage was demonstrated. The probe transmittance for the induced birefringence was estimated to be 92%. For the photoinduced molecular orientation with noncentrosymmetry, the sample was irradiated simultaneously by coherent superposition of the 1500-nm fundamental and 750-nm second-harmonic light of a femtosecond laser. The second-harmonic generation (SHG) conversion efficiency of a 105-μm thick film was estimated to be about 2%.
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Jinhai Si, Jianrong Qiu, Kazuyuki Hirao, "Photoinduced molecular orientation in bulk azodye-doped polymer by nonresonant femtosecond laser pulses", Proc. SPIE 5280, Materials, Active Devices, and Optical Amplifiers, (12 May 2004); doi: 10.1117/12.516686; https://doi.org/10.1117/12.516686
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KEYWORDS
Second-harmonic generation

Birefringence

Molecular lasers

Molecules

Polymers

Absorption

Femtosecond phenomena

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