Passive phasing of fiber amplifier arrays are promising for the power scaling of high power fiber
laser systems. The broadband operation of passively phased systems mitigates nonlinear effects such
as Stimulated Brillouin Scattering. This leads to the possibility of scaling the individual fiber
amplifiers in the passively phased arrays to multi-kilowatt power levels. In effect, a smaller number
of fiber amplifiers can be used compared to other methods of fiber amplifiers combining. We report
the passive phasing of 16 Yb-doped fiber amplifiers at 5W each for a total of 80W.
System temporal response in passively phased fiber amplifier arrays dictates how fast a passively phased system can correct for phase fluctuations due to thermal and mechanical effects. The system response time was measured by employing a variable-speed mechanical chopper in the feedback loop of a passively phased system then measuring the on-axis output intensity of the system as a function of time. Observed relaxation oscillations are compared to theory. The system response time was measured to be about 20 μsec. We also find that passive phasing improved the system's beam stability and extraction efficiency.
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