Progress on high power Raman fiber lasers at 1.48 and 1.7 µm

We report the results from Raman fiber lasers with CW output powers of 224 Watts at 1.48 μm and 168 Watts at 1.7 μm, both of which are to the best of our knowledge the highest output powers from cascaded Raman resonators at these wavelengths. The Raman fiber lasers use unique Raman filter fibers to prevent threshold at the next Stokes wavelength, allowing for high spectral purity in the desired Stokes. In addition, the 1.7 μm output is pulsed to achieve 1.4 mJ in an 8.5 µs FWHM pulse.