Internal gratings create powerful, spectrally pure lasers with high efficiencies

The combination of reliable output powers of 7W, peak power conversion efficiencies in excess of 60 percent and spectral widths below 1 nm can be realized by incorporating Integrating distributed feedback gratings into broad-area lasers, says a team from the Ferdinand Braun Institut, Germany.
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Source: Compound Semiconductor, January/February 2011