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Opt Lett. 2008 Feb 15;33(4):384-6.

Efficient power scaling of laser radiation by spectral beam combining.

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  • 1CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.

Erratum in

  • Opt Lett. 2008 Apr 1;33(7):760.


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 >1 MW/cm2 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 >750 W near-diffraction-limited cw beam has been demonstrated experimentally.

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