The possibility of achieving multikilowatt laser radiation by spectrally combining beams using volume Bragg gratings (VBGs) is shown. The VBGs recorded in a photothermorefractive glass exhibit long-term stability of all its parameters in high-power laser beams with power density in the cw beam of total power on a kilowatt level. We consider an architecture-specific beam-combining scheme and address the cross-talk minimization problem based on optimal channel positioning. Five-channel high efficiency spectral beam combining resulted in a near-diffraction-limited cw beam has been demonstrated experimentally.
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CorrectionsArmen Sevian, Oleksiy Andrusyak, Igor Ciapurin, Vadim Smirnov, George Venus, and Leonid Glebov, "Efficient power scaling of laser radiation by spectral-beam combining: erratum," Opt. Lett. 33, 760-760 (2008)