Fig. 1. Absorption spectra of a-cut, b-cut and c-cut Ho∶YAP crystal

Fig. 2. Room temperature fluorescence spectra of a-cut, b-cut and c-cut Ho∶YAP crystal

Fig. 3. Experimental schematic of Ho∶YAP laser

Fig. 4. Continuous wave (CW) laser output power characteristics of Ho∶YAP crystal

Fig. 5. CW laser output spectra of Ho∶YAP crystal in different cutting directions. (a) a-cut; (b) b-cut; (c) c-cut

Fig. 6. Variation of Q-switched Ho∶YAP laser output power versus pump power

Fig. 7. Output spectra of Q-switched a-cut Ho∶YAP laser at different pump power. (a) 37.3 W; (b) 44.3 W

Fig. 8. Beam quality factor M² of a-cut Ho∶YAP crystal at pulse laser power of 7 W

Fig. 9. Output spectrum of Q-switched c-cut Ho∶YAP laser

Fig. 10. Output pulse of c-cut Ho∶YAP laser

Fig. 11. Beam quality factor of c-cut Ho∶YAPcrystal at pulse laser power of 10 W

Fig. 12. Output spectra of b-cut Ho∶YAP laser

Fig. 13. Output pulse waveform of b-cut Ho∶YAP laser

Fig. 14. Pulse laser power stability test of b-cutHo∶YAP crystal

Fig. 15. Beam quality factor of b-cut Ho∶YAP crystal at pulse laser power of 16 W