Passively mode-locked Ytterbium-doped double-clad fiber laser

We consider an Yb-doped double-clad fiber laser in a unidirectional ring cavity containing a polarizer placed between two half-wave plates. Depending on the orientation of the phase plates, the laser operates in continuous, Q-switch, mode-lock or unstable self-pulsing regime. An experimental study of the stability of the mode locking regime is realized versus the orientation of the half-wave plates. A model for the stability of self-mode locking and cw operation is developed. The model is reduced to a master equation in which the coefficients are explicitly dependent on the orientation angles of the phase plates.

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