Abstract
Passively Q-switched microchip lasers have attracted much attention recently, for application in fields
including LiDAR and laser manufacturing. Recently, high-power single longitudinal- and transversemode
microchip lasers have been used in the THz area. In the present paper, we report a passively
Q-switched microchip laser amplifying system that uses a high-power fiber coupling QCW-LD stack as
a pumping source. A maximum pulse energy of 34.5 mJ with 370 ps pulse width and a peak power of
93 MW with single longitudinal- and transverse-mode laser are achieved at 30-Hz repetitions, while the
incident pump power is 310 mJ.
