Cladding-pumped Raman fiber laser with 0.78% quantum defect enabled by phosphorus-doped fiber

Abstract The quantum defect (QD) is an important issue that demands prompt attention in high-power fiber lasers. A large QD may aggravate the thermal load laser, which would impact frequency, amplitude noise and mode stability, threaten security of laser system. Here, we propose demonstrate a cladding-pumped Raman (RFL) with less than 1%. Using gain boson peak phosphorus-doped to enable cladding pump, reduced as low 0.78% 23.7 W output power. To our knowledge, this lowest ever reported RFL. Furthermore, power can be scaled 47.7 1.29%. This work not only offers preliminary platform for realization low-QD lasers, but also proves great potential lasers scaling.