A system includes a laser-diode bar (17) comprising an emitting surface and a reflective surface opposing the emitting surface. The laser-diode bar (17) includes a positive-side surface and a negative-side surface opposing the positive-side surface for conducting electrical energy through laser-diode bar. The system also includes a heat sink (11) thermally coupled to the laser-diode bar (17). The heat sink (11) is made of a material selected from the group consisting of Skeleton-cemented diamond and diamond- copper composite. The system also includes a heat spreader (19) interposed between the heat sink (11) and the laser-diode bar (17). The heat spreader (19) includes a first surface thermally interfacing the positive-side surface of the laser-diode bar (17). The first surface is substantially smoother than a surface on the heat sink (11) and includes an electrically conductive material for conducting the electrical energy into the laser-diode bar (17).
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