Fig. 1. Layout of Er:YAG laser with directly diode-pumping and graphene Q-switching.

Fig. 2. Input–output characteristics in CW and Q-switched mode.

Fig. 3. Measured spectrum of the Er:YAG laser. Dashed line, spectrum in CW mode.

Fig. 4. Pulse shape at 53.2 kHz pulse repetition rate: (a) single-pulse and (b) pulse train.

Fig. 5. Relationship between pulse repetition rate or pulse width and incident pump power.

Fig. 6. Relationship between pulse energy and incident pump power.

Fig. 7. Beam characterization at the maximum average output power.