Abstract
Coherently phased fiber arrays are being studied as a means of obtaining high-power high-radiance laser systems from a multitude of individual fiber emitters. A common maser oscillator is used to seed 7 fiber amplifiers in parallel. For coherent combining, optical phase-noise of amplifiers is a critical issue for obtaining good beam quality amplified laser. Experimental configuration of 7-beams ten-watt level fiber amplifiers is presented, and phase changes of combined beams are measured. It is found that phase noise at low frequencies is weakly dependent on the number of lasers while susceptible to pump current. This work paves the way towards designing such fiber optic phased arrays to very high power systems.
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