Abstract

A femtosecond laser inscription technique is proposed for the fabrication of a fiber grating laser directly into a nonphotosensitive gain fiber. A distributed Bragg reflector fiber grating laser is realized in a conventional, untreated $\mathrm{Er}:\mathrm{Yb}$-codoped fiber as an illustration. Robust, single-mode, single-polarization laser operation at temperatures in excess of $600°\mathrm{C}$ is further achieved without compromising performance. A nonlinear, thermally induced wavelength shift is also observed at elevated temperatures.

© 2006 Optical Society of America

Direct inscription of Bragg gratings in coated fibers by an infrared femtosecond laser

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