Vorontsov Mikhail A, Weyrauch Thomas
Appl Opt. 2016 Dec 10;55(35):9950-9953. doi: 10.1364/AO.55.009950.
Sprangle et al. [Appl. Opt.54, F201 (2015)APOPAI0003-693510.1364/AO.54.00F201] recently concluded that our experiments on coherent combining of laser beams over an atmospheric path [Opt. Lett.36, 4455 (2011)OPLEDP0146-959210.1364/OL.36.004455] were "effective only because at these low-power levels the linewidth of the lasers was very narrow… and the level of atmospheric turbulence was low…." These conclusions are inaccurate, not relevant to practical high-power coherently combined laser systems, and contradict our most recent experiments with coherent combining of 21 laser beams with a linewidth of about 1 GHz over 7 km distance. In this comment we also challenge the major conclusion of Sprangle et al. [Appl. Opt.54, F201 (2015)APOPAI0003-693510.1364/AO.54.00F201] and the more recently published paper by Nelson et al. [Appl. Opt.55, 1757 (2016)APOPAI0003-693510.1364/AO.55.001757] regarding inefficiency of coherent beam combining under typical atmospheric conditions.
斯普朗格尔等人[《应用光学》54卷，F201（2015年），ISSN 0003 - 6935，doi:10.1364/AO.54.00F201]最近得出结论，我们在大气路径上进行的激光束相干合成实验[《光学快报》36卷，4455（2011年），ISSN 0146 - 9592，doi:10.1364/OL.36.004455]“之所以有效，仅仅是因为在这些低功率水平下，激光的线宽非常窄……并且大气湍流水平较低……”。这些结论是不准确的，与实际的高功率相干合成激光系统无关，并且与我们最近进行的在7千米距离上对21束线宽约为1吉赫兹的激光进行相干合成的实验相矛盾。在本评论中，我们还对斯普朗格尔等人[《应用光学》54卷，F201（2015年），ISSN 0003 - 6935，doi:10.1364/AO.54.00F201]以及尼尔森等人[《应用光学》55卷，1757（2016年），ISSN 0003 - 6935，doi:10.1364/AO.55.001757]最近发表的关于在典型大气条件下相干光束合成效率低下的主要结论提出质疑。
