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We consider an Yb-doped double-clad fiber laser in a unidirectional ringcavity containing a polarizer placed between two half-wave plates. Depending onthe orientation of the phase plates, the laser operates in continuous,Q-switch, mode-lock or unstable self-pulsing regime. An experimental study ofthe stability of the mode locking regime is realized versus the orientation ofthe half-wave plates. A model for the stability of self-mode-locking and cwoperation is developed starting from two coupled nonlinear Schrodingerequations in a gain medium. The model is reduced to a master equation in whichthe coefficients are explicitly dependent on the orientation angles of thephase plates. Analytical solutions are given together with their stabilityversus the angles

Experimental and theoretical study of the passively mode-locked ytterbium-doped double-clad fiber laser