Hybrid (Raman-Ytterbium) ring-cavity fabry-perot-filtered fiber laser

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.

Automated summary

The performance of a Raman fiber laser was modified step-by-step, changing from a simple free-running distributed-feedback cavity to a ring configuration, adding a Fabry-Perot filter, and inserting a piece of Yb3+-doped fiber. Each modification resulted in changes to the emitted spectrum, increased efficiency, and improved power stability. The enhancements led to emission of a single-line with improved stability and decreased oscillating threshold. These modifications offer alternatives for achieving more stable, efficient, and pure emission in Raman fiber lasers.