Abstract
With the availability of reliable high power laser diode modules, diode-pumped solid-state lasers attract increasing attention in the field of material processing. In soldering and hardening applications, with its low demands on beam quality and power density, the laser diodes themselves can be used [Bey]. However, for marking and drilling of metals a peak power density beyond 108 W/cm2 is required. When this has to be combined with a beam-quality in the range of 10–20 mm*mrad, the aid of a solid-state laser is necessary. Stacked arrays of microchannel-cooled cw bars, emitting up to 200W/cm2 pumping power density, enable the realization of compact and stable high-average power solid-state lasers. Optical efficiencies of 30% are routinely obtained in high power cw and high repetition rate q-switched operation.
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