Leger J R, Swanson G J, Veldkamp W B
Appl Opt. 1987 Oct 15;26(20):4391-9. doi: 10.1364/AO.26.004391.
Binary phase diffraction gratings are shown to couple light coherently from a laser array into a single on-axis beam. The diffraction grating, designed to split a single beam into a specific number of equal intensity diffraction orders, is placed inside the cavity formed by the laser array and a common output mirror. The grating superimposes the light beams from the lasers in the array and produces a far-field pattern with the same divergence as that of a single laser. Six GaAlAs lasers from an antireflection-coated linear array were combined with a coupling efficiency of 68.4%. The far field of the combined GaAlAs lasers consisted of a single on-axis Gaussian beam.
二元相位衍射光栅可将激光阵列中的光相干耦合到单束同轴光束中。该衍射光栅旨在将单束光分成特定数量的等强度衍射级，它被放置在由激光阵列和一个公共输出镜形成的腔内。光栅将阵列中各激光器发出的光束叠加在一起，并产生一个与单个激光器发散角相同的远场图样。来自一个镀有增透膜的线性阵列的六个GaAlAs激光器被组合在一起，耦合效率为68.4%。组合后的GaAlAs激光器的远场由一束单同轴高斯光束组成。
