Product Code: ICAL05_402

> 76% CW Wall-plug Efficiency at High Powers from 0.98-µM Emitting Laser Diodes: Sheds Shows Route To 1kw Cw Diode Laser Bar
Authors:
Paul Crump, nLight Corporation; Vancouver WA USA
Shiguo Zhang, nLight Corporation; Vancouver WA USA
Weimin Dong, nLight Corporation; Vancouver WA USA
Mike Grimshaw, nLight Corporation; Vancouver WA USA
Damian Wise, nLight Corporation; Vancouver WA USA
Mark DeFranza, nLight Corporation; Vanouver WA USA
Sandrio Elim, nLight Corporation; Vancouver WA USA
Jun Wang, nLight Corporation; Vancouver WA USA
Jason Farmer, NLight Corporation; Vancouver WA USA
Suhit Das, nLight Corporation; Vancouver WA USA
Mark DeVito, nLight Corporation; Vancouver WA USA
Presented at ICALEO 2005

Through careful optimization of electrical and optical characteristics, broad area laser diodes deliver wall-plug in excess of 76% and powers in excess of 100W across the 9xx-nm band. Cryogenic testing of single emitter devices delivers peak efficiency of 85%, confirming there is no fundamental physical limit to reaching extremely high device efficiency. Further optimization and more radical structures show a clear path to efficiencies in excess of 80% even at room temperature.
Combining a high efficiency bar with an optimized heat-sink shows the potential for reaching peak CW powers in excess of 1-kW per single 1-cm diode bar. These power levels are comparable to more conventional CO2 lasers, with the potential to be available at significantly lower prices.

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