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Pump depletion and Stokes beam clean up at Raman conversion in graded-index fibers

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Abstract

Multimode 940-nm diode radiation is shown to be converted in graded-index fibers into high-quality (M2≤2) 976-nm Raman beam due to parabolic pump beam, its homogeneous depletion above threshold, mode-selective feedback by FBG and nonlinear effects.

© 2020 The Author(s)

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