Fig. 1. Experimental schematic.

Fig. 2. Output characteristics of 2.1 µm AO Q-switched Ho:YAG laser. (a) Average output power and pulse width vary with pump power in the CW and Q-switched regimes; (b) laser output spectrum in the CW and Q-switched regimes; (c) the pulse profile under the maximum average output power (the insert is the corresponding pulse train with a repetition rate of 15 kHz); (d) the beam quality factor under the maximum average output power (the inserts are 2D and 3D profiles).

Fig. 3. Output characteristics of ZGP-OPO. (a) Average output power and pulse width vary with pump power; (b) OPO output spectrum; (c) pulse profiles of depleted pump laser and generated OPO laser pulses; (d) beam quality factor of 4.3 µm at the maximum output power; (e) total ZGP-OPO output power stability.