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Study of Mode Instabilities in High Power Fiber Amplifiers by Detecting Scattering Light

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A novel method to study mode instabilities (MI) in high power fiber laser has been proposed and demonstrated, which is implemented by detecting the scattering signal light of the output laser reaching an extended scattering surface. Based on the method, the long-time temporal characteristic of the MI were studied for the first time by testing a 30/250μm double-clad step index fiber in a single-pass co-pumped all-fiberized amplifier. The amplifier is power scaled up to ~240W of extracted output power without MI. It is shown that the new method can distinguish the onset of MI and also represent the fluctuation characters of the output beam profiles. The fluctuation amplitude of the MI exists grow-up times ranging from ~1s to ~40s, which becomes shorter as laser power increases.

© 2014 Optical Society of America

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