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A laser diode-stack end-pumped electro-optically Q-switched Nd:YAG slab oscillator-amplifier system with near-diffraction-limited output is demonstrated by a stable-unstable hybrid resonator. The average power of 100 W at a repetition rate of 10 kHz with a pulse width 14.7ns and average power of 76.3 W at a repetition rate of 5 kHz with a pulse width of 10.2ns are measured. At the repetition rate of 10 kHz and at an output power of 89W, the beam quality factors M2 in the unstable and stable directions are 1.3 and 1.5, respectively.

We present a simple and compact design for an all-solid-state laser amplifier system which can output 9.43-kHz 630-ps, 3.5-Wpulse trains under 20 W absorbed pumping power. The excellent matching between the repetition of its seed source and the fluorescence lifetime of the amplifying medium makes it quiet efficient for the four-pass amplifier to be pumped in cw mode without need of any synchronization device between the oscillator and the amplifier. The entire setup just covers an area of 55 × 25 cm2. The output average power fluctuation is less than ±1.5% within 10min and 3% within 6h.

We report a diode stack end-pumped Nd:GdVO4 slab laser with a near-diffraction-limited beam. The output power of 45.8 W at 1064 nm is obtained under the pumping power of 147 W, with the optical-optical conversion efficiency of 31.2%, and the slope efficiency is 39.6%.

Efficient diode stack end-pumped slab lasers with a hybrid cavity were demonstrated. About 60 W of near-diffraction-limited output was obtained with Nd∶YVO4 slab crystals. The lower doped Nd∶YVO4 crystal shows the possibility of further power scaling with near-diffraction-limited output but it also increases the sensitivity of the wavelength to the temperature of the cooling water.