Spectral relationship of photoinduced refractive index and absorption changes in fulgide films |
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| Authors: | N. Menke Y. Wang W. Dong M. Lei Y. Chen |
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| Affiliation: | 1. State Key Laboratory of Transient Optics Technology , Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences , Xi'an, China;2. Department of Physics , College of Sciences and Technology, Inner Mongolia University , Huhhot, China;3. State Key Laboratory of Transient Optics Technology , Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences , Xi'an, China;4. Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Beijing, China |
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| Abstract: | Fulgides are one kind of organic photochromic compound, which are famous for their thermal irreversibility. In this report, from the difference spectra of the absorption ΔA(λ) of one kind of pyrrylfulgide, the spectral refractive index change Δn(λ) was calculated by the Kramers–Kronig relation (KKR), and a good correlation of theoretically derived values and the experimental values of the Δn measured by a modified Michelson interferometer was found. Further, it is demonstrated that it was possible to calculate the spectral dependence of diffraction efficiency from the easily accessible absorption changes. This method will be a useful tool for the characterization and optimization of fulgide films. The results show that the diffraction efficiency is high at 488 and 750 nm, where the absorption is very small, so we can realize non-destructive reconstruction. |
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| Keywords: | fulgide Kramers–Kronig relation (KKR) photoinduced absorption changing spectrum photoinduced refractive index changing spectrum diffraction efficiency spectrum non-destructive reconstruction |
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