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Raman spectra from polymethyl methacrylate (PMMA) core polymer optical fibres (POFs) in the 200–6800 cm −1 range were investigated using an Ar + ion laser. Raman peak shifting and Raman spectra broadening were observed and analysed in the POFs. Polarized laser-induced birefringence in an azobenzene-doped PMMA fibre material was investigated. We found both a fast response mode and a slow response mode in the rise and decay process of the laser-induced birefringence. It is demonstrated that the characteristics of polarized laser-induced birefringence were strongly dependent on the pump laser power.
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Xu et al. (2002) studied this question.
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