Fig. 1. Material properties of the laser crystal and SA. (a) Polarized absorption spectra of the Er:Yb:YAB crystal and (b) transmission spectrum T_SA of the employed Co²⁺: MgAl₂O₄ crystal.

Fig. 2. Experimental setup for the PQS Er:Yb:YAB microchip laser.

Fig. 3. Microchip laser pumped by a CW LD. (a) Average output power and pulse energy and (b) pulse repetition rate and pulse duration versus incident pump power.

Fig. 4. Microchip laser operated at the incident power of 6.3 W. (a) Pulse train profile and the pulse repetition rate. (b) Single-pulse profile and pulse duration; the inset shows the laser spectrum.

Fig. 5. Energy level structure and main transitions in the Er:Yb:YAB laser.

Fig. 6. Microchip laser pumped by a QCW LD. (a) Average output power and pulse energy and (b) pulse repetition rate and pulse duration versus pump peak power.

Fig. 7. Microchip laser operated at the QCW pump power of 20 W. (a) Pulse train profile and the pulse repetition rate. (b) Single-pulse profile and pulse duration; the inset shows the laser spectrum.