To address the spatial constraints in unmanned aerial vehicle target detection systems,a scheme for a multi-beam scanning passive Q-switched microchip array solid-state laser is proposed.This system utilizes a six-core semicon-ductor laser array to compactly pump a strip-shaped Nd:YAG/Cr4+:YAG bonded crystal.At a pumping power of 1.6 W per path,it generates six output laser beams with a wavelength of 1 064.4 nm,pulse width of 2.4 ns,beam quality of 1.39,peak power of 3.75 kW,and a repetition frequency up to 22 kHz.The entire system's volume is only 2 cm×2 cm×1.5 cm,and achieves simultaneous output of six laser paths.The study investigated the impact mechanism of the ini-tial transmittance of the Q-switching crystal and the reflectivity of the output mirror on the laser pulse repetition frequen-cy and peak power,with a particular focus on the uniformity of the laser output from the pump source cores.The feasi-bility of using a single laser-bonded crystal to produce multiple narrow pulse laser beams in the nanosecond range was experimentally verified.The research results demonstrate the miniaturized structure's ability to achieve multi-beam emis-sion from a passive Q-switched solid-state laser,providing insights for the miniaturization and integration of laser sourc-es in detection systems.
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