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13 February 2008 Highly reliable qcw laser bars and stacks
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Based on a well established technology for continuous-wave (cw) diode lasers, further development and optimization lead to high performance laser bars for quasi-continuous-wave (qcw) operation suitable for pumping applications. Mounted on standard heat sinks, these 808nm laser bars exhibit more than 300W (400W) qcw output power with 50% (75%) filling factors. Reliability tests of these bars are running at >200W. Several GShots at 2, 4 and 10% duty cycle (d.c.) were already achieved. With this high performance qcw laser bars, passively cooled laser stacks were developed and tested using a new design compatible to high power operation. Thermal expansion matched materials and hard solder techniques allow reliable operation, even under rough environmental conditions. Output powers of 2.5kW (>300W per bar) were demonstrated from a stack with 8 bars. After environmental tests (vibration and thermal cycles), an ongoing life test exhibits more than 2.5GShots with 1.6kW (~200W per bar) at 4% duty cycle.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Deichsel, D. Schröder, J. Meusel, R. Hülsewede, J. Sebastian, S. Ludwig, and P. Hennig "Highly reliable qcw laser bars and stacks", Proc. SPIE 6876, High-Power Diode Laser Technology and Applications VI, 68760K (13 February 2008);

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