Abstract
A high-power tenth-order harmonic mode-locked GdVO4/Nd:GdVO4 laser is reported under diode direct pumping. Using the large third-order nonlinearity of Nd:GdVO4, a Z-folded cavity was constructed for colliding pulse mode locking. The tenth-order harmonic mode-locked pulses were attributed to the colliding of the counter-propagating pulses induced by the Kerr self-focusing effects in the laser crystal, and the pulses were further modulated by a semiconductor saturable absorber mirror. At the absorbed pump power of 23.1 W, an average output power of 5.8 W in TEM00 mode was obtained with the repetition rate of 0.83 GHz and the pulse width of 30 ps, corresponding to an optical–optical efficiency of 25.1% and a slope efficiency of 37.1%, respectively.
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