Abstract

A three-stage Yb-fiber amplifier emitted $1.43\mathrm{kW}$ of single-mode power when seeded with a $25\mathrm{GHz}$ linewidth master oscillator (MO). The amplified output was polarization stabilized and phase locked using active heterodyne phase control. A low-power sample of the output beam was coherently combined to a second fiber amplifier with 90% visibility. The measured combining efficiency agreed with estimated decoherence effects from fiber nonlinearity, linewidth, and phase-locking accuracy. This is the highest-power fiber laser that has been coherently locked using any method that allows brightness scaling.

© 2010 Optical Society of America

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