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13 February 2008Highly reliable qcw laser bars and stacks
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.
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E. Deichsel, D. Schröder, J. Meusel, R. Hülsewede, J. Sebastian, S. Ludwig, P. Hennig, "Highly reliable qcw laser bars and stacks," Proc. SPIE 6876, High-Power Diode Laser Technology and Applications VI, 68760K (13 February 2008); https://doi.org/10.1117/12.761476