Abstract

A new coherent polarization beam combination (CPBC) architecture was employed to combine four amplified beams and produce over $25\mathrm{W}$ of coherent output with 94% efficiency and nearly diffraction-limited beam quality. The individual beams were produced by a fiber master oscillator power amplifier system and their phases were controlled and locked using servo-controlled phase modulators. The CPBC approach relies on a coherent superposition of orthogonal polarization states and allows the combination of an arbitrary number of beams with arbitrary power ratios.

© 2010 Optical Society of America

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