19 February 2009 Theoretical analysis of multiplexed volume holograms for spectral beam combining
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Abstract
Volume holographic elements can potentially combine many spectrally distinct laser beams using multiplexed Bragg gratings. However, there are theoretical limits imposed by the interactions between these gratings. A method of numerical simulation has been developed to analyze the interactions between many hundreds of multiplexed gratings in a single volume holographic element. We apply this tool to the problem of spectral beam combining of incoherent laser sources. Various system parameters limit the number of beams that can be combined under maximum bandwidth and minimum efficiency constraints. System designs are shown that combine 180-350 lasers ranging over a 60nm bandwidth with theoretical efficiencies in excess of 99%.
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G. B. Ingersoll, J. R. Leger, "Theoretical analysis of multiplexed volume holograms for spectral beam combining", Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 71951P (19 February 2009); doi: 10.1117/12.809524; https://doi.org/10.1117/12.809524
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