Hybrid Beam Combination by Active Phasing and Bandwidth-Controlled Dichromatic Mirror

In this letter, we present what we believe to be a new design for simultaneously coherent and spectral beam combinations by active phasing and bandwidth-controlled dichromatic mirror. A principle of concept experiment is demonstrated by employing eight 20-W power-level polarization-maintained all fiber amplifiers, which generate a 142.1-W near diffraction limited ( and ) output power with the whole combining efficiency of %. The new designed beam combining system is competent for both narrow-band and broadband gain elements with full linewidth of nm. Along with the near-diffraction-limited power scaling progress on monolithic polarization-maintained amplifier, we believe that the approach demonstrated has great potential for remarkable power boosting in both continuous- and pulsed-wave operations.