Opt Lett. 2018 Jul 15;43(14):3269-3272. doi: 10.1364/OL.43.003269.
We demonstrate, to the best of our knowledge, the first two-dimensional diffractive beam combination for ultrashort pulses-a highly scalable technique capable of using a diffractive optic pair to combine large arrays of ultrashort pulsed beams. A square array of eight 120 fs pulsed beams from eight fiber outputs is coherently combined into one beam using the diffractive combiner. The experimental results show that the combined pulse preserves the input pulse width and shape, and the combining efficiency is measured to be close to the limit of the manufactured diffractive optic. An analysis shows that the combining loss due to uncompensated temporal and spatial dispersions is negligible.
据我们所知，我们首次演示了二维衍射光束组合用于超短脉冲-这是一种高度可扩展的技术，能够使用衍射光学元件对大量超短脉冲光束进行组合。通过衍射组合器，将从八个光纤输出端出射的八个 120fs 脉冲光束的正方形阵列相干组合成一个光束。实验结果表明，组合后的脉冲保持了输入脉冲的宽度和形状，并且组合效率接近制造的衍射光学元件的极限。分析表明，由于未补偿的时间和空间色散引起的组合损耗可以忽略不计。
