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Theory of Q switching in actively mode-locked lasers

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Abstract

An analytic theory is proposed that characterizes Q switching in an active mode-locked cavity as the nonlinear interaction of two unstable modes: one symmetric, another antisymmetric. The phase difference between these modes generates a nonlinear beating interaction that gives rise to quasi-periodic behavior in the laser cavity. This quasi-periodic behavior is responsible for the Q-switching phenomenon and is controlled by the interaction and overlap between neighboring pulses. With a linear stability analysis, a simple qualitative description of the Q-switching phenomenon is given that is verified with numerical simulations of the governing active mode-locked equations. This model characterizes the Q switching as a function of the physical parameters of the laser cavity and elucidates the mechanisms for controlling its behavior.

© 2006 Optical Society of America

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Equations (26)

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