… However, lasing is possible in a long fiber without any point mirrors via random
distributed feedback provided by Rayleigh backscattering, which is much simpler and more
stable.In 2014 we showed that, despite its open laser cavity design, the generation
efficiency of a random Raman fiber laser can be superior to those of conventional Raman
fiber lasers. To achieve this, we designed the laser with a short (%1 km) cavity.The
feedback mechanism comes from distributed Rayleigh scattering along the …