Abstract
We demonstrate a divergence-narrowed broad-area laser-diode array (LDA) with an external-cavity configuration that consists of a beam-transformation system and an off-axis reflecting mirror. Sixteen off-axis external-cavity laser diodes are formed for the high-power LDA. At a drive current of 21.2 A (four times the threshold current), the divergence angle full width at half maximum of the slow axis is reduced from 7.26° without the external cavity to 1.45° with the external cavity. The external-cavity LDA achieves a cw power output of 9.8 W, which is 60% of the free-running LDA.
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