研究了高功率端泵浦 Nd:YAG 板条激光器的退偏特性，通过使用高功率偏振片和 90°石英旋光片，实现了对高功率板条激光器输出激光的偏振状态控制和退偏补偿，有效提升了激光器线偏振光输出功率及其近场光强分布的均匀性。实验表明，通过优化偏振补偿方式，激光器线偏振输出功率由 8.7k W 提升至 9.6k W，退偏率由 30.8%降至 3.1%。 The depolarization characteristics of the high power end-pumped Nd: YAG slab lasers are studied. The polarization state control and depolarization compensation of the output lasers of high power slab lasers are realized by using high power polarizers and 90 ° quartz polarizers. The output power of the laser linearly polarized light and the uniformity of the near-field light intensity distribution are effectively improved. Experiments show that by optimizing the polarization compensation mode, the laser linear polarization output power increased from 8.7k W to 9.6k W, the de-rate from 30.8% to 3.1%.