An electro-optic Q-switched multiwavelength laser diode array end-pumped Nd:YAG laser without temperature control is proposed and demonstrated in this paper. Using a 3.2 kW multiwavelength laser diode array as the pump source, a lens duct as the coupling system, RTP crystals as the Q-switch, and an end-pumped Nd:YAG crystal rod (O 6 × 60 mm2) as the gain medium, the laser system obtained a maximum output pulse energy of 72 mJ at room temperature with a pulse width of 15.8 ns, a repetition rate of 20 Hz, and an optic-optic conversion efficiency of 11.25%. Meanwhile, the output energy increased from 69 mJ at −40 °C to 78 mJ at 60 °C, with an energy instability of less than 10% and a pulse width instability of less than 15% over the full temperature range of 100 °C. The divergence angles of the output laser in the horizontal and vertical directions were measured as 2.5 and 2.6 mrad, respectively. The work the authors have done will provide important references for other researchers to carry out similar research studies.

中文翻译：

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多波长二极管阵列端泵浦热稳定 Nd:YAG 脉冲激光器

本文提出并演示了一种无温度控制的电光调Q多波长激光二极管阵列端部泵浦Nd:YAG激光器。使用 3.2 kW 多波长激光二极管阵列作为泵浦源，透镜导管作为耦合系统，RTP 晶体作为 Q 开关，末端泵浦 Nd:YAG 晶体棒（O 6 × 60 mm2）作为增益介质，激光系统在室温下获得最大输出脉冲能量为72 mJ，脉冲宽度为15.8 ns，重复频率为20 Hz，光光转换效率为11.25%。同时，输出能量从−40 °C 时的 69 mJ 增加到 60 °C 时的 78 mJ，在 100 °C 的整个温度范围内能量不稳定性小于 10%，脉宽不稳定性小于 15% . 输出激光在水平和垂直方向的发散角分别测量为 2.5 和 2.6 mrad。作者所做的工作将为其他研究人员开展类似研究提供重要参考。