Bragg Gratings Made With a Femtosecond Laser in Heavily Doped Er-Yb Phosphate Glass Fiber

• Published in: IEEE photonics technology letters Vol. 19; no. 12; pp. 943 - 945
• Main Authors: Grobnic, D., Mihailov, S.J., Walker, R.B., Smelser, C.W., Lafond, C., Croteau, A.
• Format: Journal Article
• Language: English
• Published: New York IEEE 15-06-2007; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bragg gratings; Erbium-doped fiber lasers; Femtosecond; Fiber gratings; Fiber lasers; Fibers; Glass; Infrared radiation; Lasers; Optical fiber polarization; Optical fibers; Optical waveguides; Phosphate glass; Phosphates; Reflectivity; Silicon compounds; Ultrafast optics
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2007.898816

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