Study of Raman scattering of plastic optical fiber

The Stimulated Raman scattering spectrum of polymethyl methacrylate(PMMA) plastic fiber was measured and the characteristic of the first order Raman spectrum was studied. The threshold, spectral bandwidth was measured. The formation mechanism of stimulated Raman scattering spectrum was analyzed. The first order Raman spectral bandwidth of plastic optical fiber is less and the volume is 2.8nm or so and it is not changed with the energy of pump light. The Raman frequency shift is 2563 cm(-1) Compared with silica fiber, PMMA plastic fiber has smaller spectrum width, bigger Raman frequency shift and lower threshold of energy density. The energy transfer mechanism of silica fiber is the same with PMMA plastic fiber.