An ultra-lightweight and compact diode-pumped solid-state laser has been developed targeting the applications of LiDAR in resource exploitation, environmental monitoring, etc. We have achieved Q-switched pulse energy of above 650 μJ at a central wavelength of 1534 nm with an optical conversion efficiency of 3.3% in the operating frequency range of 1-20 Hz at a peak pump power of 10 W. In our experiments, we used a 940-nm semiconductor laser to pump Er,Yb co-doped glass with a saturable absorber (Co:Spinel) to realize passive Q switching. Meanwhile, we have developed a theoretical model for this Er,Yb co-doped glass laser under pulsed pumping. This model was validated in both gain-switching and Q-switching scenarios, taking into account the presence of excited state absorption and up-conversion effects. The simulation results are in excellent agreement with the experimental ones.
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