Spectral beam combining of Yb-doped fiber lasers using wavelength dependent polarization rotators and polarization beam combiners

We propose a robust spectral beam combining scheme using wavelength dependent polarization rotators and polarization beam combiners. We successfully demonstrated the concept for two Yb-doped fiber lasers at 1064 nm and 1092 nm up to a total input power of 90 W. The results reveal a very good combining efficiency and the potential for scaling to high power operations in this method of beam combining.