Abstract

We present the optical repetition rate stabilization of an Erbium-doped femtosecond all-fiber laser utilizing an additional intracavity Ytterbium-doped fiber. The pump-dependent refractive index change of optically pumped active fibers is well-described [1 – 3] and already used, e.g., for coherent combining of continuous-wave Erbium amplifiers by Ytterbium fibers [3] and vice versa [2]. However, the obvious step to apply this technique for the stabilization of the repetition rate of a mode-locked laser can now be reported for the first time.

© 2013 IEEE