Dual-Grating Spectral Beam Combination of High-Power Fiber Lasers |
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Authors: | Madasamy P. Jander D.R. Brooks C.D. Loftus T.H. Thomas A.M. Jones P. Honea E.C. |
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Affiliation: | Lockheed Martin Aculight, Bothell, WA; |
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Abstract: | We describe a dual-grating spectral beam combination (SBC) system to combine multiple high-power fiber laser outputs while maintaining near-diffraction-limited beam quality. The two gratings are parallel in a grating rhomb configuration, with input and output beams that are parallel but shifted with wavelength, rather than the typical angular dispersion of a single grating. The resulting advantage of the dual-grating SBC over other beam combination systems is the relaxation of the linewidth requirement. We combined two fiber lasers with output powers of 115 W each and linewidths of about 0.15 nm ( ~40 GHz) to produce a combined beam of 190 W power with near-diffraction-limited beam quality (M 2 ~ 1.18). |
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