Abstract: A laser diode array includes a dielectric block with a "direct bonded" conductor layer. The conductor layer is segmented by diode bar spaces cut through it, and a laser diode bar is positioned in each space. Current through the conductor layer energizes the laser diode bars. In one form, the laser diode array and the conductor layer form a conductor ring surrounding a laser medium which is energized by the laser diode bars. In another form, a coolant flow tube within the conductor ring forms an annular coolant channel around the enclosed laser medium. In still another form, the conductor ring is itself surrounded by coolant channels.