UV-induced index change in hydrogen-free germano-silicate waveguides

Fig. 3 Photograph of upconverted emission from dye and BPM simulation displaying trajectory of offset Gaussian beam launched into parabolic profile a Upconverted emission from dye Separation of fringes is 360pmf7% b BPM simulation Simulation: A finite difference beam propagation method (BPM) [7] was used to simulate propagation along the GRIN using the experimentally measured parabolic profiie both with and without the polymer coating. The field distribution displayed in Fig. 3b was found to have a of periodicity of 361p-1, in good agreement with the periodic separation of the fringes observed in the polymer layer, Fig. 3a.