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Narrow linewidth operation of a spectral beam combined diode laser bar

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Abstract

Our experiment is expected to provide an approach for realizing ultranarrow linewidth for a spectral beam combined diode laser bar. The beams of a diode laser bar are combined in a fast axis after a beam transformation system. With the help of relay optics and a transform lens with a long focal length of 1.5 m, the whole wavelength of a spectral combined laser bar can be narrowed down to 0.48 nm from more than 10 nm. We have achieved 56.7 W cw from a 19-element single bar with an M2 of 1.4(in horizontal direction)×11.6(in vertical direction). These parameters are good evidence that all the beams from the diode laser bar are combined together to increase the brightness.

© 2016 Optical Society of America

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