Raman spectra of polymethyl methacrylate optical fibres excited by a 532 nm diode pumped solid state laser

Abstract

Polymethyl methacrylate (PMMA) optical fibres are fabricated by a preform drawing process.\nThe Raman spectra of PMMA fibres are recorded using a diode pumped solid state laser\nemitting at 532 nm and a CCD-spectrograph in the 400–3800 cm−1 range. The variation of the\nRaman intensity with the length of the optical fibre is studied. Investigations are carried out on\nthe variation of FWHM of the Raman peak at 2957 cm−1 with the length of the optical fibre and\npump power. The differential scattering cross section and gain coefficient of the Raman peak at\n2957 cm−1 in PMMA are calculated in relation to that of toluene