Multi-kW, Uncooled Densely Packed Fiber Array for Laser Beam Combining

An array of seven fiber collimators with transmission ~99.9% was tested with 1.99 kW per channel. Truncated radiation was disposed through output collimating lenses by re-directing Gaussian beam tails with interior holey micro-lenses. For range of truncation of 5-29% cooling was not necessary. Beam quality in the far-field M2 ~1.2.