Realization of 7-channel beam coherent beam combination based on coherent fiber-optics-array collimator

We proposed a design of coherent fiber-optics-array collimator (CFAC) which is mainly composed of a single unitary collimating lens and prism. The CFAC system can be regarded as a “sub-aperture” of the whole fibers array in the tiledaperture scheme to expand combining channels efficiently due to its simple and compact structure. Then, we setup an experiment to verify the feasibility of the CFAC system with seven fiber lasers arranged in two dimensions and the CBC in 1064nm wavelength using single-frequency dithering algorithm is successfully achieved. By careful calculation, the residual errors among the laser beams are suppressed below λ/20 through an active-piston-phase control.

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