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Spectral beam combining of Yb-doped fiber lasers with high efficiency

: Klingebiel, S.; Roser, F.; Ortac, B.; Limpert, J.; Tünnermann, A.


Journal of the Optical Society of America. B, Optical physics 24 (2007), No.8, pp.1716-1720
ISSN: 0740-3224
ISSN: 1520-8540
Journal Article
Fraunhofer IOF ()
photonic crystal fiber; low-nonlinearity

Spectral beam combining is a power scaling concept for fiber lasers, where several individual laser beams with different wavelengths are overlapped utilizing a dispersive element. We present a combination of three master-oscillator power-amplifier fiber laser systems to a total power of 153 W. Due to the employment of single-polarization low-nonlinearity photonic crystal fibers in the main amplification stages a combining efficiency as high as 95% has been realized. The measured beam quality of M2=1.2 for each laser does not decrease for the combined beam. Thus this setup provides excellent opportunities for brightness enhancement. Additional considerations for further increase in power are made