Liu Shixin, Shi Xinlei, Liu Hang, Peng Wanjing, Feng Yujun, Sun Yinhong, Ma Yi, Zhao Zhigang, Gao Qingsong, Liu Zhaojun, Tang Chun
Opt Lett. 2024 Feb 15;49(4):891-894. doi: 10.1364/OL.502874.
A high-power all-fiber radially polarized laser system is demonstrated, in which an integrated nanograting mode convertor (S-wave plate) is used for the generation of radially polarized beam. Experimentally, a 1-W radially polarized beam was used as the seed laser, whose mode purity and mode extinction ratio (MER) were 96.5% and 98.3%, respectively. A single-stage few-mode fiber amplifier was employed to boost the 1-W seed laser to an average power of 113.2 W, when the pump power was 160 W. The corresponding slope efficiency and beam quality factor (M) were approximately 72% and 2.3%, respectively. Moreover, the mode purity and MER of the amplified radially polarized laser were measured to be 95.7% and 97%, respectively. To the best of our knowledge, this is the highest output power from an all-fiber radially polarized laser system without obvious degradations of the mode purity and MER.
展示了一种高功率全光纤径向偏振激光系统，其中集成纳米光栅模式转换器（S波片）用于产生径向偏振光束。实验中，使用1W的径向偏振光束作为种子激光，其模式纯度和模式消光比（MER）分别为96.5%和98.3%。当泵浦功率为160W时，采用单级少模光纤放大器将1W的种子激光提升至平均功率113.2W。相应的斜率效率和光束质量因子（M）分别约为72%和2.3%。此外，测量得到放大后的径向偏振激光的模式纯度和MER分别为95.7%和97%。据我们所知，这是全光纤径向偏振激光系统在模式纯度和MER无明显退化情况下的最高输出功率。
