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Coherent beam combining of two fibre amplifier chains with a total power of 260 W in a compact system using the stochastic parallel gradient descent(SPGD) algorithm is demonstrated.A 150 MHz linewidth fibre laser is built and introduced for high-power amplification to mitigate stimulated Brillouin scattering(SBS).Compact high-power amplifier chains are built with low power all-fibre system and high-power bulk free-optics fibre amplifiers.When the total power is about 260 W,active phase-locking of two high-power amplifiers is demonstrated using the SPGD algorithm.In closed-loop,the power in the main lobe increases 1.68 times,the visibility is increased from 0 to 0.62,and the phase residual error is less thanλ/10.
Coherent beam combining of two fiber amplifier chains with a total power of 260 W in a compact system using the stochastic parallel gradient descent (SPGD) algorithm is demonstrated. A 150 MHz linewidth fiber laser is built and introduced for high-power amplification to mitigate stimulated Brillouin scattering (SBS). Compact high-power amplifier chains are built with low power all-fiber system and high-power bulk free-optics fiber amplifiers. The total power is about 260 W, active phase-locking of two high-power amplifiers are demonstrated using the SPGD algorithm. In closed-loop, the power in the main lobe increases 1.68 times, the visibility is increased from 0 to 0.62, and the phase residual error is less than λ / 10.