Over three hundred watts linearly-polarized supercontinuum laser source

We report an all-fiber linearly-polarized supercontinuum laser source with 322.5 W average output power and spectrum covering 800 nm to 2200 nm. A spectral subtraction method is utilized to measure the polarization extinction ratio (PER) of the laser source, which can directly measure the PER of each single wavelength within a wide spectral range. Through detail observation of the PER distribution along wavelengths, an interesting four-wave mixing (FWM) phenomenon between the two orthogonal polarization states is found in the laser system.