Output characteristics of high-power continuous wave Raman fiber laser at 1484 nm using phosphosilicate fiber

A continuous wave (CW) high-power Raman fiber laser (RFL) with maximum outp ut power of 2.24 W and slope efficiency of 32.8% at 1484 nm is obtained usi ng a CW 8.4 W/1064 nm Yb-doped double-clad fiber laser as a pump, 700 m pho sphosilicate fiber, and cascaded cavities with two pairs of fiber Bragg gra ting mirrors for the first and the second Stokes orders. Theoretical simula tion of the RFL using a very efficient and rapidly converging collocation m ethod is done to understand and optimize the fiber length to obtain maximum second Stokes power. RFL performance for the 300, 700 and 1150 m phosphosi licate fiber lengths was experimentally investigated by observing maximum o utput power, slope efficiency, threshold power, and full-width at half maxi mum at the second Stokes wavelength.