Fig. 1. Layout of the Ho:YVO4 unidirectional ring laser.

Fig. 2. Output power of the bidirectional Ho:YVO4 laser versus the pump power.

Fig. 3. Wavelength of the bidirectional Ho:YVO4 laser.

Fig. 4. Fabry–Perot spectrum of the bidirectional Ho:YVO4 laser.

Fig. 5. Fabry–Perot spectrum of the single-longitudinal-mode Ho:YVO4 unidirectional ring laser.

Fig. 6. Output power of the single-longitudinal-mode Ho:YVO4 unidirectional ring laser.

Fig. 7. Wavelength of the single-longitudinal-mode Ho:YVO4 unidirectional ring laser.

Fig. 8. Beam radius versus the distance from the focusing lens.