Fig. 1. Schematic diagram of the experimental device view (a) in the x–z plane and (b) in the y–z plane.

Fig. 2. Comparison of free running and Q-switched average output power under continuous pumping.

Fig. 3. Pulse energy and pulse width at 2 kHz repetition rate.

Fig. 4. Beam quality factor M2. (a) The beam quality M2 in the unstable direction. (b) The beam quality M2 in the stable direction.

Fig. 5. Spot images around the beam waist. (a) Unstable direction. (b) Stable direction.