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Kilowatt-level high efficiency all-fiberized Raman fiber amplifier based onpure passive fiber is proposed for the first time in this paper. The lasersystem is established on master oscillator power amplification configurationwhile a piece of graded-index passive fiber is utilized as stokes shifting aswell as gain medium, which is entirely irrelevant to rare-earth-doped gainmechanism. When the pump power is 1368.8 W, we obtained 1002.3 Wcontinuous-wave laser power at 1060 nm with the correspondingoptical-to-optical efficiency of 84%. The beam parameter M2 improves from 9.17of the pump laser to 5.11 of the signal laser through the amplificationprocess, and the brightness enhancement is about 2.57 at maximum output poweras a consequence of the beam clean-up process in the graded-index fiber. To thebest of our knowledge, we have demonstrated the first kilowatt-level highefficiency Raman fiber amplifier based on pure passive fiber with brightnessenhancement.

Pure passive fiber enabled highly efficient Raman fiber amplifier with record kilowatt power