Here we explore a highly multimode fiber amplifier, where stimulated Brillouin scattering is greatly suppressed due to reduction of light intensity in a large fiber core and broadening of Brillouin scattering spectrum by multimode excitation. To control the output beam profile, we apply spatial. High-power single-frequency multimode fiber amplifier with good beam quality Stefan Rothe, Chun-Wei Chen, Peyman Ahmadi, Kabish Wisal, Mert Ercan, Nathan Vigne, A. By adjusting the powers and orientation of input pump modes, modal dependent gain can be tuned over a large dynamic range. Performance. Demonstrates a high-power cladding-pumped large-core Yb fiber laser. The pumping direction and wavelength are set using an attached script, so the differences in pumping schemes can be easily compared.
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