Military laser bar packs 300 watts into 300-gram package

DILAS in Mainz, Germany, developed a fiber-coupled laser diode module that meets a critical military-application goal: less than 1 kilogram of weight per kilowatt of power while maintaining nearly 50 percent efficiency. Actual specifications for the 976-nanometer laser are greater than 300 watts output power in a 200-micron-diameter/0.22-numerical-aperture fiber-coupled package with a weight of roughly 300 grams. The small, lightweight package includes a low-thermal-impedance heat sink on which the laser diode bar is mounted to remove waste heat. The micro-optics attachment process is automated to improve beam quality from the laser diode bar through high-efficiency fiber coupling.

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