Fig. 1. Schematics of energy level transitions of Tm³⁺ and Ho³⁺

Fig. 2. Experimental setup diagram of Ho∶YLF pumped by Tm∶YAP laser

Fig. 3. Tm∶YAP power versus LD power

Fig. 4. Measurement results of beam quality factor (continuous-wave operation)

Fig. 5. Ho∶YLF power versus Tm∶YAP power

Fig. 6. Measurement results of beam quality factor (Q-switching operation)

Fig. 7. Influence of π polarization ratio on power and optical-optical efficiency

Fig. 8. Pulse energy and pulse width versus pulse energy of Tm∶YAP laser