Here we report the changes in performance of a Raman fiber laser subjected to step-by-step modifications. The laser scheme departed from a simple free-running distributed-feedback cavity that was firstly modified into a ring configuration, then a Fabry-Perot filter was inserted and it was finally completed by inserting a piece of Yb3+- doped. Every modification changed the emitted spectrum, increased the efficiency and improved the power stability. The main result of modifying the simplest two-band emitting configuration into a ring cavity was the emission of a single-band with improved stability. Then a Fabry-Perot filter was inserted to the ring cavity, obtaining in this way a single-line oscillation. The last step consisted on inserting a piece of Yb3+-doped fiber that mainly contributed to force the decrease of the oscillating threshold. We propose these schemes as alternatives for achieving more stable, more efficient and with superior spectral purity (single-line emission) in Raman fiber lasers.
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