| Citation: | ZHAO Qian-xi, WANG He-peng, WU Cong-zheng, LI Yan, ZOU Yong-gang, XU Ying-tian, ZHANG Chong. High-Temperature LDAs-Pumped Zigzag Nd:YAG High-Energy Pulse Laser[J]. Chinese Optics. doi: 10.37188/CO.2025-0147
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To achieve simultaneous lightweight design and high-energy output under special environmental conditions, a compact, water-cooling-free high-energy pulsed laser system based on high-temperature laser diode array (LDAs) side-pumped zigzag Nd:YAG crystals is demonstrated for operation in demanding environments. The zigzag beam propagation increases the effective gain length, while symmetric LDAs pumping of two Nd:YAG crystals improves gain uniformity. Thermal isolation between the crystals and LDAs is implemented, with independent temperature control achieved using thermoelectric coolers (TEC) for the Nd:YAG crystals and forced air cooling for the LDAs. A potassium dideuterium phosphate (DKDP) crystal is employed for electro-optic Q-switching. At a repetition rate of 100 Hz without water cooling, a maximum pulse energy of 129.2 mJ with a pulse duration of 9.0 ns is obtained, corresponding to an optical-to-optical efficiency of 9.6% and a slope efficiency of 13.1%, with energy stability better than 2.26%. An output energy of 87.6 mJ is achieved at 150 Hz. This system provides a compact and environmentally robust light source for laser ranging and illumination applications.
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