Abstract
By considering the influence of the turn-off time and the modulation frequency of the acousto-optic (AO) modulator, the coupled rate equations for a diode-pumped doubly Q-switched and mode-locked (QML) laser with AO modulator and Cr4+∶YAG saturable absorber under Gaussian approximation are given. By numerically solving these equations, the key parameters of an optimally coupled doubly QML laser including the gain medium, the saturable absorber and the resonator as well as the modulation frequency of AO modulator are obtained, which can maximize the pulse energy of singly Q-switched envelope. A diode-pumped doubly QML Nd∶GdVO4 laser with AO modulator and Cr4+∶YAG saturable absorber is constructed and the experimental results are in agreement with the numerical simulations.
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