Fig. 1. Schematic of the six-beam Nd：YAG/Cr⁴⁺：YAG passive Q-switched microchip array end-pumped solid-state laser

Fig. 2. Experimental setup of the Nd：YAG/Cr⁴⁺：YAG passive Q-switched microchip array end-pumped solid-state laser

Fig. 3. The repetition rate and the peak power: (a) variation curve of the repetition rate with the initial transmittance T0 and the output mirror reflectivity R; (b) variation curve of the peak power with the initial transmittance T0 and the output mirror reflectivity R

Fig. 4. Spot image with six channels working simultaneously

Fig. 5. Output beam quality and far-field beam spot shape of laser

Fig. 6. Pulse width waveform, pulse sequence waveform and wavelength measurement diagram: (a) pulse width waveform of the 1 064 nm output laser; (b) pulse sequence waveform of the 1 064 nm output laser (repetition rate is 22 kHz); (c) wavelength measurement diagram of the output laser (linewidth is 26 pm)

Fig. 7. Variation curve of average output power of the six laser diodes with different currents

Fig. 8. Instability curve of six laser diodes within 5 minutes at 1.6 W power

Fig. 9. Wavelength curve of six laser diodes within 5 minutes when the current is 2 A

Fig. 10. Variation curve of the repetition rate with the pump power

Fig. 11. Variation curve of the output power with the pump power

Fig. 12. Average output power curve of six laser diodes within 3 minutes when the pump power is 1.6 W