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Experimental setup. MO denotes master oscillator, PA denotes preamplifier, PM denotes phase modulator, MA denotes main amplifier, ISO denotes optical isolator, and LCO denotes large diameter collimator.
Output power characteristics of the four fiber amplifiers.
Beam characteristics of one fiber amplifier (a) intensity distribution and (b) optical spectrum.
Intensity pattern at the observing plane (a) Experimental beam profiles in open loop. (b) Experimental beam profiles in close loop, and (c) Simulated beam profiles in close loop.
Frequency spectrum of the time-series signal of the power encircled in the pinhole.
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