All-fiber coherent beam combining of fiber lasers.

Beam combining of ytterbium fiber amplifiers (Invited)

Fiber lasers are well suited to scaling to high average power using beam-combining techniques. For coherent combining, optical phase-noise characterization of a ytterbium fiber amplifier is required to perform a critical evaluation of various approaches to coherent combining. For wavelength beam combining, we demonstrate good beam quality from the combination of three fiber amplifiers, and we d...

Incoherent beam combining using stimulated Brillouin scattering in multimode fibers.

A beam combining technique for producing a single, spatially coherent beam from two mutually incoherent (temporally and spatially) lasers is demonstrated and the spatial coherence properties of the resulting beam are characterized. The technique is based on simultaneous excitation of stimulated Brillouin scattering by two independent lasers operating at two different wavelengths in a long multi...

Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique

Towards 100 kW fiber laser systems

Fiber lasers are rapidly gaining market shares for industrial applications due to compactness, high electrical-to-optical efficiency, high beam quality and low running cost. However, for directed energy weapons, fiber lasers have until now been unable to meet the requirements of military, where power levels around 100 kW are aimed for through combining of multiple, high beam quality lasers. The...

Coherent Beam Combining Element for Five 150-w Fiber Lasers by Volume Bragg Gratings in Ptr Glass