Northrop Grumman Aerospace Systems, Redondo Beach, California 90278, USA.
Opt Lett. 2012 Sep 15;37(18):3741-3. doi: 10.1364/ol.37.003741.
We demonstrate coherent beam combining using a two-dimensionally patterned diffractive optic combining element. Fifteen Yb-doped fiber amplifier beams arranged in a 3×5 array were combined into a single 600 W, M²=1.1 output beam with 68% combining efficiency. Combining losses under thermally stable conditions at 485 W were found to be dominated by spatial mode-mismatch between the free space input beams, in quantitative agreement with calculations using the measured amplitude and phase profiles of the input beams.
我们使用二维图案衍射光学组合元件实现了相干光束组合。将 15 个 Yb 掺杂光纤放大器光束排列成 3×5 阵列，组合成一个 600 W 的单个输出光束，M²=1.1，组合效率为 68%。在 485 W 的热稳定条件下，发现组合损耗主要由自由空间输入光束之间的空间模式失配引起，这与使用输入光束的测量幅度和相位分布进行计算的结果定量一致。
