Bragg grating DFB Fiber Laser

A single-frequency Distributed Feedback (DFB) fiber laser consists of an active fiber, a Bragg grating, and a semiconductor pump diode. Erbium-, Ytterbium- and Thulium-doped fibers are used as a gain medium. The Bragg grating defines the mirror of the laser cavity and is imprinted in the fiber laser by ultra-violet illumination through a phase mask. Finally, a pump laser generates the population inversion in the active fiber. The key to the fiber laser’s low noise is its fundamental structure, with the fiber Bragg grating ensuring very stable emission and high frequency stability. The laser packaging reduces the lasers susceptibility to acoustic pickup and vibrations.