Fig. 1. Schematic diagram of the laser module device

Fig. 2. Comparison of experimental and simulated thermal focal lengths of the crystal under different pump power levels

Fig. 3. Schematic diagram of the Yb:YAG AO Q-switched oscillator

Fig. 4. 3D model rendering of the experimental setup for the Yb:YAG acousto-optic Q-switched oscillator

Fig. 5. Relationship between the fundamental mode spot diameter and the thermal focal length in the resonator

Fig. 6. Relationship between single-pulse output energy and pump peak power under different pump repetition frequencies. Inset (top-left): 30 min energy stability test of the 1030 nm laser at maximum output energy

Fig. 7. Relationship between average output power and pump peak power under different Q-switching repetition frequencies and in non-Q-switched operation

Fig. 8. Pulse waveform of the Yb:YAG oscillator under a single pump pulse envelope at a Q-switching repetition frequency of 10 kHz. Inset: expanded profile of a single ns pulse

Fig. 9. Measurement results of the beam quality factor M², with the inset showing the far-field spot shape