Fig. 1. Experimental setup of blue laser diode pumped Pr:YLF laser

Fig. 2. Energy level scheme of Pr:YLF with transitions

Fig. 3. Fluorescence spectrum of Pr:YLF crystal in cavity

Fig. 4. Laser spectrum of 720 nm

Fig. 5. Schematic diagram of off-axis end pump

Fig. 6. Schematic diagram of adjusting M2 pitch and yaw angle

Fig. 7. Theoretical HG modes and experimental spatial modes for different OC positions

Fig. 8. Simulation and experimental spatial distributions for high-order modes.