This paper presents a laser diode (LD) end-pumped square-rod Nd:glass laser system capable of achieving joule-level output energy at 1-Hz repetition rate. The laser system generated 966 mJ of energy in a 5-ns pulse for a pumping energy of 9.66 J at 802 nm, corresponding to an optical-to-optical conversion efficiency of 10%, which is higher than those of similar existing systems. A single-pass small-signal gain of 2.54 and pulse energy stabilities of 2.5% (peak-valley) and 0.37% (root-mean-square) were achieved by eight-pass amplification. The output energy of 966 mJ was generated, and the near-field modulation of 90% beam aperture was 1.37; further, the 82.5% far-field energy concentration was 2.5 times higher than the diffraction limit. The measured single-pass thermally induced wavefront aberration (1.15$\lambda$) was similar to that calculated using the thermal model. The beam quality could be further improved using adaptive phase corrector technology.

本文提出了一种激光二极管（LD）泵浦方杆Nd：玻璃激光系统，该系统能够以1 Hz的重复频率实现焦耳级输出能量。激光系统在5 ns脉冲中产生了966 mJ的能量，在802 nm处的泵浦能量为9.66 J，对应于10％的光-光转换效率，高于类似的现有系统。通过八通放大，可以实现2.54的单通小信号增益和2.5％（峰值谷）和0.37％（均方根）的脉冲能量稳定性。产生的输出能量为966 mJ，光束孔径为90％的近场调制为1.37；此外，82.5％的远场能量浓度比衍射极限高2.5倍。测得的单程热感应波前像差（1.15$\lambda$）与使用热模型计算的结果相似。使用自适应相位校正器技术可以进一步提高光束质量。