Abstract

Commercial $0.5\mathrm{kW}$ Yb-doped fiber amplifiers have been characterized and found to be suitable for coherent beam combining. Eight such fiber amplifiers have been coherently combined in a tiled-aperture configuration with 78% combining efficiency and total output power of $4\mathrm{kW}$. The power-in-the-bucket vertical beam quality of the combined output is 1.25 times diffraction limited at full power. The beam-combining performance is independent of output power.

© 2011 Optical Society of America

Coherent beam combination of 1.08 kW fiber amplifier array using single frequency dithering technique

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