D. Grobnic, S. J. Mihailov, R. B. Walker, C. W. Smelser, C. Lafond, A. Croteau "Bragg gratings made with a femtosecond laser in heavily doped Er-Yb phosphate glass fiber" IEEE Photonics Technology Letters, 19(12):943-945, 2007
Abstract: Bragg gratings made in heavily doped phosphate glass fibers using ultrafast infrared radiation and a phase mask are reported. Refractive indexes >1.5times10-3 were induced in Er-Yb-doped phosphate fiber in a few seconds of exposure corresponding to reflectivity above 99.99% for a 6-mm-long grating. Annealing test up to 400 degC shows good thermal stability of the grating structure.
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