100W high-brightness multi-emitter laser pump
2011
We report results of a spatially-multiplexed broad area laser diode platform designed for efficient pumping of fiber lasers
or direct-diode systems. Optical output power in excess of 100W from a 105μm core, 0.15NA fiber is demonstrated with
high coupling efficiency. The compact form factor and low thermal resistance enable tight packing densities needed for
kW-class fiber laser systems. Broad area laser diodes have been optimized to reduce near- and far-field performance and
prevent blooming without sacrificing other electro-optic parameters. With proper lens optimization this produces ~5%
increase in coupling / wall plug efficiency for our design. In addition to performance characteristics, an update on long
term reliability testing of 9XX nm broad area laser diode is provided that continues to show no wear out under high
acceleration. Under nominal operating conditions of 12W ex-facet power at 25C, the diode mean time to failure (MTTF)
is forecast to be ~ 480 kh.
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