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High power fiber lasers operating at the 1.5micron wavelength region haveattractive features like eye-safety and atmospheric transparency, and cascadedRaman fiber lasers offer a convenient method to obtain high power sources atthese wavelengths. A limitation to power scaling however has been the lowerconversion efficiency of these lasers. We recently introduced a high efficiencyarchitecture for high power cascaded Raman fiber lasers applicable for1.5micron fiber lasers. Here we demonstrate further power scaling using thisnew architecture. Using numerical simulations we identify the ideal operatingconditions for the new architecture. We demonstrate a high efficiency 1480nmcascaded Raman fiber laser with an output power of 301 W, comparable to recordpower levels achieved with rare-earth doped fiber lasers in the 1.5 micronwavelength region.

Power scaling of high efficiency 1.5micron cascaded Raman fiber lasers