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Cascaded Raman lasers enable high powers at various wavelength bandsinaccessible with conventional rare-earth doped lasers. The input and outputwavelengths of conventional implementations are fixed by the constituent fibergratings necessary for cascaded Raman conversion. We demonstrate here, a simplearchitecture for high power, fixed and wavelength tunable, grating-free,cascaded Raman conversion between different wavelength bands. The architectureis based on the recently proposed distributed feedback Raman lasers. Here, weimplement a module which converts the Ytterbium band to the eye-safe 1.5micronregion. We demonstrate pump-limited output powers of over 30W in fixed andcontinuously wavelength tunable configurations.

High power, fixed and tunable wavelength, Grating-free Cascaded Raman fiber Lasers